-
Notifications
You must be signed in to change notification settings - Fork 1
/
f5.c
913 lines (796 loc) · 26.7 KB
/
f5.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2020-2021 David Woodhouse, Daniel Lenski
*
* Author: David Woodhouse <[email protected]>, Daniel Lenski <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#include <config.h>
#include "openconnect-internal.h"
#if HAVE_JSON
#include "json.h"
#endif
#include "ppp.h"
#include <libxml/HTMLparser.h>
#include <libxml/HTMLtree.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#define XCAST(x) ((const xmlChar *)(x))
/* XX: some F5 VPNs simply do not have a static HTML form to parse, but
* only a mess of JavaScript which creates a dynamic form that's
* functionally equivalent to the following:
*
* <form id="auth_form" method="post">
* <input type="text" name="username"/>
* <input type="password" name="password"/>
* </form>
*/
static struct oc_auth_form *plain_auth_form(void)
{
struct oc_auth_form *form;
struct oc_form_opt *opt, *opt2;
form = calloc(1, sizeof(*form));
if (!form) {
nomem:
free_auth_form(form);
return NULL;
}
if ((form->auth_id = strdup("auth_form")) == NULL)
goto nomem;
opt = form->opts = calloc(1, sizeof(*opt));
if (!opt)
goto nomem;
opt->label = strdup("username:");
opt->name = strdup("username");
opt->type = OC_FORM_OPT_TEXT;
opt2 = opt->next = calloc(1, sizeof(*opt2));
if (!opt2)
goto nomem;
opt2->label = strdup("password:");
opt2->name = strdup("password");
opt2->type = OC_FORM_OPT_PASSWORD;
return form;
}
static int check_cookie_success(struct openconnect_info *vpninfo)
{
struct oc_vpn_option *cookie;
const char *session = NULL, *f5_st = NULL;
/* XX: The MRHSession cookie is often set repeatedly to new values prior
* to the completion of authentication, so it is not a sufficient
* indicator of successfully completed authentication by itself.
*
* The combination of the MRHSession and F5_ST cookies appears to be
* reliable indicator. F5_ST is a "session timeout" cookie (see
* https://support.f5.com/csp/article/K15387).
*/
for (cookie = vpninfo->cookies; cookie; cookie = cookie->next) {
if (!strcmp(cookie->option, "MRHSession"))
session = cookie->value;
else if (!strcmp(cookie->option, "F5_ST"))
f5_st = cookie->value;
}
if (session && f5_st) {
free(vpninfo->cookie);
if (asprintf(&vpninfo->cookie, "MRHSession=%s; F5_ST=%s", session, f5_st) <= 0)
return -ENOMEM;
return 0;
}
return -ENOENT;
}
#ifdef HAVE_JSON
static json_value *find_appLoader_configure_json_form(xmlDocPtr doc)
{
xmlNodePtr root, node;
json_value *v = NULL, *f = NULL;
/* We look for a <script> tag containing a call to 'appLoader.configure(...);', with
* the assumption that there will be a newline right before the closing parenthesis,
* and a semicolon right after, allowing us to clearly delimit it. Ick. Then we assume
* that everything between the parentheses is a valid JSON object literal. Ick.
*/
for (root = node = xmlDocGetRootElement(doc); node; node = htmlnode_dive(root, node)) {
if (node->name && !strcasecmp((char *)node->name, "script")) {
const char *content = (char *)xmlNodeGetContent(node);
const char *start, *end;
if ((start = strstr(content, "appLoader.configure({"))
&& (end = strstr(start, "\n});"))) {
v = json_parse((json_char *)start + 20, (end + 2) - (start + 20));
break;
}
}
}
if (!v || v->type != json_object)
goto bad_json;
json_value *l = NULL;
for (int i = 0; i < v->u.object.length; i++) {
json_value *subval = v->u.object.values[i].value;
json_char *subname = v->u.object.values[i].name;
if (!strcmp(subname, "logon") && subval->type == json_object) {
l = subval;
break;
}
}
if (!l)
goto bad_json;
for (int i = 0; i < l->u.object.length; i++) {
json_value *subval = l->u.object.values[i].value;
json_char *subname = l->u.object.values[i].name;
if (!strcmp(subname, "form") && subval->type == json_object) {
f = subval;
/* "Detach" this sub-tree (XX: check for mem leaks here) */
f->parent = NULL;
l->u.object.values[i].value = NULL;
break;
}
}
bad_json:
json_value_free(v);
return f;
}
static struct oc_auth_form *parse_json_form(struct openconnect_info *vpninfo, json_value *jform,
int (*can_gen_tokencode)(struct openconnect_info *vpninfo, struct oc_auth_form *form, struct oc_form_opt *opt))
{
struct oc_auth_form *form = calloc(1, sizeof(*form));
if (!form) {
nomem:
free_auth_form(form);
return NULL;
}
json_value *fields = NULL;
for (int i = 0; i < jform->u.object.length; i++) {
json_value *subval = jform->u.object.values[i].value;
json_char *subname = jform->u.object.values[i].name;
if (!strcmp(subname, "id") && subval->type == json_string) {
form->auth_id = subval->u.string.ptr;
subval->type = json_null, subval->u.string.ptr = NULL; /* XX */
} else if (!strcmp(subname, "title") && subval->type == json_string) {
form->banner = subval->u.string.ptr;
subval->type = json_null, subval->u.string.ptr = NULL; /* XX */
} else if (!strcmp(subname, "fields") && subval->type == json_array)
fields = subval;
}
if (!fields) /* XX: Should we fail? */
return form;
struct oc_form_opt **next_opt = &form->opts;
for (int i = 0; i < fields->u.array.length; i++) {
json_value *f = fields->u.array.values[i];
if (f->type != json_object) /* XX: Should we fail? */
continue;
struct oc_form_opt *opt = calloc(1, sizeof(*opt));
if (!opt) {
nomem2:
free(opt);
goto nomem;
}
for (int j = 0; j < f->u.object.length; j++) {
json_value *subval = f->u.object.values[j].value;
json_char *subname = f->u.object.values[j].name;
if (!strcmp(subname, "type") && subval->type == json_string) {
if (!strcmp(subval->u.string.ptr, "password"))
opt->type = OC_FORM_OPT_PASSWORD;
else if (!strcmp(subval->u.string.ptr, "text"))
opt->type = OC_FORM_OPT_TEXT;
else {
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: Unknown F5 JSON form field type '%s', treating as 'text'. Please report to <%s>"),
subval->u.string.ptr, "[email protected]");
opt->type = OC_FORM_OPT_TEXT;
}
} else if (!strcmp(subname, "name") && subval->type == json_string) {
opt->name = subval->u.string.ptr;
subval->type = json_null, subval->u.string.ptr = NULL; /* XX */
} else if (!strcmp(subname, "caption") && subval->type == json_string) {
if (asprintf(&opt->label, "%s:", subval->u.string.ptr) < 0)
goto nomem2;
} else if (!strcmp(subname, "value") && subval->type == json_string && subval->u.string.length > 0) {
opt->_value = subval->u.string.ptr;
subval->type = json_null, subval->u.string.ptr = NULL; /* XX */
} else if (!strcmp(subname, "disabled") && subval->type == json_boolean) {
/* XX: Do we care if a field is disabled? */
}
}
if (opt->type == OC_FORM_OPT_PASSWORD && can_gen_tokencode && !can_gen_tokencode(vpninfo, form, opt))
opt->type = OC_FORM_OPT_TOKEN;
/* Append to the existing list */
*next_opt = opt;
next_opt = &opt->next;
}
return form;
}
#endif
int f5_obtain_cookie(struct openconnect_info *vpninfo)
{
int ret, form_order=0;
xmlDocPtr doc = NULL;
xmlNode *node;
struct oc_text_buf *req_buf = NULL;
struct oc_auth_form *form = NULL;
char *form_id = NULL;
req_buf = buf_alloc();
if ((ret = buf_error(req_buf)))
goto out;
while (++form_order) {
char *resp_buf = NULL;
char *url;
if (req_buf && req_buf->pos)
ret = do_https_request(vpninfo, "POST",
"application/x-www-form-urlencoded",
req_buf, &resp_buf, NULL, HTTP_REDIRECT_TO_GET);
else
ret = do_https_request(vpninfo, "GET", NULL, NULL, &resp_buf, NULL, HTTP_REDIRECT_TO_GET);
if (!check_cookie_success(vpninfo)) {
free(resp_buf);
ret = 0;
break;
}
if (ret < 0)
break;
url = internal_get_url(vpninfo);
if (!url) {
free(resp_buf);
nomem:
ret = -ENOMEM;
break;
}
doc = htmlReadMemory(resp_buf, ret, url, NULL,
HTML_PARSE_RECOVER|HTML_PARSE_NOERROR|HTML_PARSE_NOWARNING|HTML_PARSE_NONET);
free(url);
free(resp_buf);
if (!doc) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse HTML document\n"));
ret = -EINVAL;
break;
}
buf_truncate(req_buf);
node = find_form_node(doc);
#if HAVE_JSON
if (!node) {
/* XX: some F5 VPNs simply do not have a static HTML form to parse */
json_value *jform = find_appLoader_configure_json_form(doc);
if (jform) {
form = parse_json_form(vpninfo, jform, form_order > 1 ? can_gen_tokencode : NULL);
json_value_free(jform);
}
if (form) {
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: No HTML authentication form found. Extracted form from F5's embedded\n"
" JSON. This is EXPERIMENTAL. Please report results to <%s>.\n"),
goto process_form;
}
}
#endif
if (!node && form_order==1) {
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: no HTML login form found; assuming username and password fields\n"));
if ((form = plain_auth_form()) == NULL)
goto nomem;
} else if (form_order==1 && (xmlnode_get_prop(node, "id", &form_id) || strcmp(form_id, "auth_form"))) {
/* XX: if first form isn't named auth_form, this probably isn't an F5 VPN */
vpn_progress(vpninfo, PRG_ERR, _("Unknown form ID '%s' (expected 'auth_form')\n"),
form_id);
fprintf(stderr, _("Dumping unknown HTML form:\n"));
htmlNodeDumpFileFormat(stderr, node->doc, node, NULL, 1);
ret = -EINVAL;
goto out;
} else {
form = parse_form_node(vpninfo, node, NULL, form_order > 1 ? can_gen_tokencode : NULL);
if (!form) {
ret = -EINVAL;
goto out;
}
}
#if HAVE_JSON
process_form:
#endif
do {
ret = process_auth_form(vpninfo, form);
} while (ret == OC_FORM_RESULT_NEWGROUP);
if (ret)
goto out;
ret = do_gen_tokencode(vpninfo, form);
if (ret) {
vpn_progress(vpninfo, PRG_ERR, _("Failed to generate OTP tokencode; disabling token\n"));
vpninfo->token_bypassed = 1;
goto out;
}
append_form_opts(vpninfo, form, req_buf);
if ((ret = buf_error(req_buf)))
goto out;
if (form->action) {
vpninfo->redirect_url = form->action;
form->action = NULL;
}
free_auth_form(form);
form = NULL;
if (vpninfo->redirect_url)
handle_redirect(vpninfo);
xmlFreeDoc(doc);
doc = NULL;
}
out:
if (doc)
xmlFreeDoc(doc);
free(form_id);
if (form) free_auth_form(form);
if (req_buf) buf_free(req_buf);
return ret;
}
/*
* Parse the 'favorites' profile information from
* /vdesk/vpn/index.php3?outform=xml&client_version=2.0
* which looks something like this:
*
* <?xml version="1.0" encoding="utf-8"?>
* <favorites type="VPN" limited="YES">
* <favorite id="/Common/demo_vpn_resource">
* <caption>demo_vpn_resource</caption>
* <name>/Common/demo_vpn_resource</name>
* <params>resourcename=/Common/demo_vpn_resource</params>
* </favorite>
* </favorites>
*
* Extract the content of the "params" node which is needed for the
* next request.
*/
static int parse_profile(struct openconnect_info *vpninfo, char *buf, int len,
char **params)
{
xmlDocPtr xml_doc;
xmlNode *xml_node, *xml_node2, *xml_node3;
char *type = NULL;
int ret;
if (!buf || !len)
return -EINVAL;
xml_doc = xmlReadMemory(buf, len, NULL, NULL,
XML_PARSE_NOERROR|XML_PARSE_RECOVER);
if (!xml_doc) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse F5 profile response\n"));
vpn_progress(vpninfo, PRG_DEBUG,
_("Response was:%s\n"), buf);
return -EINVAL;
}
xml_node = xmlDocGetRootElement(xml_doc);
for (; xml_node; xml_node = xml_node->next) {
if (xml_node->type != XML_ELEMENT_NODE)
continue;
if (!xmlnode_is_named(xml_node, "favorites"))
continue;
type = (char *)xmlGetProp(xml_node, XCAST("type"));
if (!type)
continue;
if (strcmp(type, "VPN")) {
free(type);
continue;
}
free(type);
for (xml_node2 = xmlFirstElementChild(xml_node);
xml_node2;
xml_node2 = xmlNextElementSibling(xml_node2)) {
if (!xmlnode_is_named(xml_node2, "favorite"))
continue;
for (xml_node3 = xmlFirstElementChild(xml_node2);
xml_node3;
xml_node3 = xmlNextElementSibling(xml_node3)) {
if (!xmlnode_is_named(xml_node3, "params"))
continue;
*params = (char *)xmlNodeGetContent(xml_node3);
ret = 0;
goto out;
}
}
}
vpn_progress(vpninfo, PRG_ERR,
_("Failed to find VPN profile parameters\n"));
vpn_progress(vpninfo, PRG_DEBUG,
_("Response was:%s\n"), buf);
ret = -EINVAL;
out:
xmlFreeDoc(xml_doc);
return ret;
}
static int parse_options(struct openconnect_info *vpninfo, char *buf, int len,
char **session_id, char **ur_z, int *ipv4, int *ipv6, int *hdlc)
{
xmlNode *fav_node, *obj_node, *xml_node;
xmlDocPtr xml_doc;
int ret = 0, n_dns = 0, n_nbns = 0, default_route = 0, dtls = 0, dtls_port = 0;
char *s = NULL;
struct oc_text_buf *domains = NULL;
if (!buf || !len)
return -EINVAL;
xml_doc = xmlReadMemory(buf, len, NULL, NULL,
XML_PARSE_NOERROR|XML_PARSE_RECOVER);
if (!xml_doc) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse F5 options response\n"));
vpn_progress(vpninfo, PRG_DEBUG,
_("Response was:%s\n"), buf);
return -EINVAL;
}
fav_node = xmlDocGetRootElement(xml_doc);
if (!xmlnode_is_named(fav_node, "favorite"))
goto err;
obj_node = xmlFirstElementChild(fav_node);
if (!xmlnode_is_named(obj_node, "object"))
goto err;
struct oc_vpn_option *new_opts = NULL;
struct oc_ip_info new_ip_info = {};
domains = buf_alloc();
for (xml_node = xmlFirstElementChild(obj_node);
xml_node;
xml_node = xmlNextElementSibling(xml_node)) {
if (xmlnode_is_named(xml_node, "ur_Z"))
*ur_z = (char *)xmlNodeGetContent(xml_node);
else if (xmlnode_is_named(xml_node, "Session_ID"))
*session_id = (char *)xmlNodeGetContent(xml_node);
else if (xmlnode_is_named(xml_node, "IPV4_0"))
*ipv4 = xmlnode_bool_or_int_value(xml_node);
else if (xmlnode_is_named(xml_node, "IPV6_0")) {
if (!vpninfo->disable_ipv6)
*ipv6 = xmlnode_bool_or_int_value(xml_node);
} else if (xmlnode_is_named(xml_node, "hdlc_framing"))
*hdlc = xmlnode_bool_or_int_value(xml_node);
else if (xmlnode_is_named(xml_node, "idle_session_timeout")) {
int sec = vpninfo->idle_timeout = xmlnode_bool_or_int_value(xml_node);
vpn_progress(vpninfo, PRG_INFO, _("Idle timeout is %d minutes\n"), sec/60);
} else if (xmlnode_is_named(xml_node, "tunnel_dtls"))
dtls = xmlnode_bool_or_int_value(xml_node);
else if (xmlnode_is_named(xml_node, "tunnel_port_dtls"))
dtls_port = xmlnode_bool_or_int_value(xml_node);
else if (xmlnode_is_named(xml_node, "dtls_v1_2_supported"))
vpninfo->dtls12 = xmlnode_bool_or_int_value(xml_node);
else if (xmlnode_is_named(xml_node, "UseDefaultGateway0")) {
default_route = xmlnode_bool_or_int_value(xml_node);
if (default_route)
vpn_progress(vpninfo, PRG_INFO, _("Got default routes\n"));
} else if (xmlnode_is_named(xml_node, "SplitTunneling0")) {
int st = xmlnode_bool_or_int_value(xml_node);
vpn_progress(vpninfo, PRG_INFO, _("Got SplitTunneling0 value of %d\n"), st);
/* XX: Should we ignore split-{in,ex}cludes if this is zero? */
}
/* XX: This is an objectively stupid way to use XML, a hierarchical data format. */
else if ( (!strncmp((char *)xml_node->name, "DNS", 3) && isdigit(xml_node->name[3]))
|| (!strncmp((char *)xml_node->name, "DNS6_", 5) && isdigit(xml_node->name[5])) ) {
free(s);
s = (char *)xmlNodeGetContent(xml_node);
if (s && *s) {
vpn_progress(vpninfo, PRG_INFO, _("Got DNS server %s\n"), s);
if (n_dns < 3) new_ip_info.dns[n_dns++] = add_option_steal(&new_opts, "DNS", &s);
}
} else if (!strncmp((char *)xml_node->name, "WINS", 4) && isdigit(xml_node->name[4])) {
free(s);
s = (char *)xmlNodeGetContent(xml_node);
if (s && *s) {
vpn_progress(vpninfo, PRG_INFO, _("Got WINS/NBNS server %s\n"), s);
if (n_nbns < 3) new_ip_info.dns[n_nbns++] = add_option_steal(&new_opts, "WINS", &s);
}
} else if (!strncmp((char *)xml_node->name, "DNSSuffix", 9) && isdigit(xml_node->name[9])) {
free(s);
s = (char *)xmlNodeGetContent(xml_node);
if (s && *s) {
vpn_progress(vpninfo, PRG_INFO, _("Got search domain %s\n"), s);
buf_append(domains, "%s ", s);
}
}
/* XX: Like the above, but even stupider because one tag can contain multiple space-separated values. */
else if ( (!strncmp((char *)xml_node->name, "LAN", 3) && isdigit((char)xml_node->name[3]))
|| (!strncmp((char *)xml_node->name, "LAN6_", 5) && isdigit((char)xml_node->name[5]))
|| (!strncmp((char *)xml_node->name, "ExcludeSubnets", 14) && isdigit((char)xml_node->name[14]))
|| (!strncmp((char *)xml_node->name, "ExcludeSubnets6_", 16) && isdigit((char)xml_node->name[16]))) {
free(s);
s = (char *)xmlNodeGetContent(xml_node);
if (s && *s) {
char *word, *next;
int is_exclude = (xml_node->name[0] == 'E');
const char *option = is_exclude ? "split-exclude" : "split-include";
for (word = s; *word; word = next) {
for (next = word; *next && !isspace(*next); next++);
if (*next)
*next++ = 0;
if (next == word + 1)
continue;
struct oc_split_include *inc = malloc(sizeof(*inc));
if (!inc)
continue;
inc->route = add_option_dup(&new_opts, option, word, -1);
if (is_exclude) {
inc->next = new_ip_info.split_excludes;
new_ip_info.split_excludes = inc;
vpn_progress(vpninfo, PRG_INFO, _("Got split exclude route %s\n"), word);
} else {
inc->next = new_ip_info.split_includes;
new_ip_info.split_includes = inc;
vpn_progress(vpninfo, PRG_INFO, _("Got split include route %s\n"), word);
}
}
}
}
}
if (dtls && dtls_port && vpninfo->dtls_state == DTLS_NOSECRET) {
vpn_progress(vpninfo, PRG_INFO, _("DTLS is enabled on port %d\n"), dtls_port);
if (!*hdlc) {
udp_sockaddr(vpninfo, dtls_port);
vpninfo->dtls_state = DTLS_SECRET;
} else {
/* XX: HDLC-like framing (RFC1662) means that tunneled packets may double in size as part of
* their on-the-wire encapsulation, while efficient datagram transport requires calculation
* of a predictable maximum transfer unit.
*
* We hope no servers expect us to combine them. If they do, we should reject DTLS.
*/
vpn_progress(vpninfo, PRG_ERR,
_("WARNING: Server enables DTLS, but also requires HDLC. Disabling DTLS,\n"
" because HDLC prevents determination of efficient and consistent MTU.\n"));
}
}
if (default_route && *ipv4)
new_ip_info.netmask = add_option_dup(&new_opts, "netmask", "0.0.0.0", -1);
if (default_route && *ipv6)
new_ip_info.netmask6 = add_option_dup(&new_opts, "netmask6", "::/0", -1);
if (buf_error(domains) == 0 && domains->pos > 0) {
domains->data[domains->pos-1] = '\0';
new_ip_info.domain = add_option_steal(&new_opts, "search", &domains->data);
}
buf_free(domains);
ret = install_vpn_opts(vpninfo, new_opts, &new_ip_info);
if (ret || (*ipv4 < 1 && *ipv6 < 1) || !*ur_z || !*session_id) {
free_optlist(new_opts);
free_split_routes(&new_ip_info);
err:
vpn_progress(vpninfo, PRG_ERR,
_("Failed to find VPN options\n"));
vpn_progress(vpninfo, PRG_DEBUG,
_("Response was:%s\n"), buf);
ret = -EINVAL;
}
xmlFreeDoc(xml_doc);
free(s);
return ret;
}
static int get_ip_address(struct openconnect_info *vpninfo, char *header, char *val)
{
struct oc_ppp *ppp = vpninfo->ppp;
if (!ppp || ppp->ppp_state != PPPS_DEAD)
return 0;
/* If the addresses were already negotiated once in PPP and this
* is a reconnect, they'll be in vpninfo->ip_info.addr*. In that
* case don't overwrite them, and let it correctly abort if the
* server rejects the same addresses this time round. */
if (!strcasecmp(header, "X-VPN-client-IP")) {
vpn_progress(vpninfo, PRG_INFO,
_("Got Legacy IP address %s\n"), val);
if (!vpninfo->ip_info.addr)
ppp->out_ipv4_addr.s_addr = inet_addr(val);
} else if (!strcasecmp(header, "X-VPN-client-IPv6")) {
vpn_progress(vpninfo, PRG_INFO,
_("Got IPv6 address %s\n"), val);
if (!vpninfo->ip_info.addr6 && !vpninfo->ip_info.netmask6)
inet_pton(AF_INET6, val, &ppp->out_ipv6_addr);
}
/* XX: The server's IP address(es) X-VPN-server-{IP,IPv6} are also
* sent, but the utility of these is unclear. As remarked in oncp.c,
* "this is a tunnel; having a gateway is meaningless." */
return 0;
}
static int f5_configure(struct openconnect_info *vpninfo)
{
int ret;
struct oc_text_buf *reqbuf = NULL;
struct oc_vpn_option *cookie;
char *profile_params = NULL;
char *sid = NULL, *ur_z = NULL;
int ipv4 = -1, ipv6 = -1, hdlc = 0;
char *res_buf = NULL;
if (!vpninfo->cookies) {
/* XX: This will happen if authentication was separate/external */
ret = internal_split_cookies(vpninfo, 1, "MRHSession");
if (ret)
return ret;
}
/* XX: parse "session timeout" cookie to get auth expiration */
for (cookie = vpninfo->cookies; cookie; cookie = cookie->next) {
if (!strcmp(cookie->option, "F5_ST")) {
int junk;
unsigned long long start, dur;
char c = 0;
if (sscanf(cookie->value, "%dz%dz%dz%lldz%lld%c", &junk, &junk, &junk, &start, &dur, &c) >= 5
&& (c == 0 || c == 'z'))
vpninfo->auth_expiration = start + dur;
break;
}
}
free(vpninfo->urlpath);
vpninfo->urlpath = strdup("vdesk/vpn/index.php3?outform=xml&client_version=2.0");
ret = do_https_request(vpninfo, "GET", NULL, NULL, &res_buf, NULL, HTTP_NO_FLAGS);
if (ret < 0)
goto out;
ret = parse_profile(vpninfo, res_buf, ret, &profile_params);
if (ret)
goto out;
vpn_progress(vpninfo, PRG_DEBUG,
_("Got profile parameters '%s'\n"), profile_params);
free(res_buf);
res_buf = NULL;
free(vpninfo->urlpath);
if (asprintf(&vpninfo->urlpath, "vdesk/vpn/connect.php3?%s&outform=xml&client_version=2.0",
profile_params) == -1) {
ret = -ENOMEM;
goto out;
}
ret = do_https_request(vpninfo, "GET", NULL, NULL, &res_buf, NULL, HTTP_NO_FLAGS);
if (ret < 0)
goto out;
ret = parse_options(vpninfo, res_buf, ret, &sid, &ur_z, &ipv4, &ipv6, &hdlc);
if (ret)
goto out;
vpn_progress(vpninfo, PRG_DEBUG,
_("Got ipv4 %d ipv6 %d hdlc %d ur_Z '%s'\n"), ipv4, ipv6, hdlc, ur_z);
if (ipv4 == -1)
ipv4 = 0;
if (ipv6 == -1)
ipv6 = 0;
/* XX: This buffer is used to initiate the connection over either TLS or DTLS.
* Cookies are not needed for it to succeed, and can potentially grow without bound,
* which would make it too big to fit in a single DTLS packet (ick, HTTP over DTLS).
*
* Don't blame me. I didn't design this.
*/
reqbuf = vpninfo->ppp_dtls_connect_req;
if (!reqbuf)
reqbuf = buf_alloc();
buf_truncate(reqbuf);
buf_append(reqbuf, "GET /myvpn?sess=%s&hdlc_framing=%s&ipv4=%s&ipv6=%s&Z=%s&hostname=",
sid, hdlc?"yes":"no", ipv4?"yes":"no", ipv6?"yes":"no", ur_z);
buf_append_base64(reqbuf, vpninfo->localname, strlen(vpninfo->localname), 0);
buf_append(reqbuf, " HTTP/1.1\r\n");
struct oc_vpn_option *saved_cookies = vpninfo->cookies;
vpninfo->cookies = NULL; /* hide cookies */
http_common_headers(vpninfo, reqbuf);
vpninfo->cookies = saved_cookies; /* restore cookies */
buf_append(reqbuf, "\r\n");
if (buf_error(reqbuf)) {
vpn_progress(vpninfo, PRG_ERR,
_("Error establishing F5 connection\n"));
ret = buf_error(reqbuf);
goto out;
}
vpninfo->ppp_dtls_connect_req = reqbuf;
reqbuf = NULL;
ret = openconnect_ppp_new(vpninfo, hdlc ? PPP_ENCAP_F5_HDLC : PPP_ENCAP_F5, ipv4, ipv6);
out:
free(res_buf);
free(profile_params);
free(sid);
free(ur_z);
buf_free(reqbuf);
return ret;
}
int f5_connect(struct openconnect_info *vpninfo)
{
int ret = 0;
if (!vpninfo->ppp) {
/* Initial connection */
ret = f5_configure(vpninfo);
} else if (vpninfo->ppp->ppp_state != PPPS_DEAD) {
/* TLS/DTLS reconnection with already-established PPP session
* (PPP session will persist past reconnect.)
*/
ret = ppp_reset(vpninfo);
}
if (ret) {
err:
openconnect_close_https(vpninfo, 0);
return ret;
}
ret = ppp_tcp_should_connect(vpninfo);
if (ret <= 0)
goto err;
ret = openconnect_open_https(vpninfo);
if (ret)
goto err;
if (vpninfo->dump_http_traffic)
dump_buf(vpninfo, '>', vpninfo->ppp_dtls_connect_req->data);
ret = vpninfo->ssl_write(vpninfo, vpninfo->ppp_dtls_connect_req->data,
vpninfo->ppp_dtls_connect_req->pos);
if (ret < 0)
goto err;
struct oc_text_buf *resp_buf = buf_alloc();
if (buf_error(resp_buf)) {
ret = buf_free(resp_buf);
goto err;
}
ret = process_http_response(vpninfo, 1, get_ip_address, resp_buf);
buf_free(resp_buf);
if (ret < 0)
goto err;
if (ret != 201 && ret != 200) {
vpn_progress(vpninfo, PRG_ERR,
_("Unexpected %d result from server\n"),
ret);
ret = (ret == 504) ? -EPERM : -EINVAL;
goto err;
}
/* Trigger the first PPP negotiations and ensure the PPP state
* is PPPS_ESTABLISH so that our mainloop knows we've started. */
ppp_start_tcp_mainloop(vpninfo);
monitor_fd_new(vpninfo, ssl);
monitor_read_fd(vpninfo, ssl);
monitor_except_fd(vpninfo, ssl);
return 0;
}
int f5_bye(struct openconnect_info *vpninfo, const char *reason)
{
char *orig_path;
char *res_buf = NULL;
int ret;
/* We need to close and reopen the HTTPS connection (to kill
* the f5 tunnel) and submit a new HTTPS request to logout.
*/
openconnect_close_https(vpninfo, 0);
orig_path = vpninfo->urlpath;
vpninfo->urlpath = strdup("vdesk/hangup.php3?hangup_error=1"); /* redirect segfaults without strdup */
ret = do_https_request(vpninfo, "GET", NULL, NULL, &res_buf, NULL, HTTP_NO_FLAGS);
free(vpninfo->urlpath);
vpninfo->urlpath = orig_path;
if (ret < 0)
vpn_progress(vpninfo, PRG_ERR, _("Logout failed.\n"));
else
vpn_progress(vpninfo, PRG_INFO, _("Logout successful.\n"));
free(res_buf);
return ret;
}
int f5_dtls_catch_probe(struct openconnect_info *vpninfo, struct pkt *pkt)
{
char *line = (void *)pkt->data, *cr, *colon;
int first = 1, status = -1;
pkt->data[pkt->len] = 0;
while (line && *line) {
if (*line == '\n') {
line++;
continue;
}
cr = strchr(line, '\r');
if (!cr)
break;
*cr = 0;
if (first) {
char junk, c = 0;
if (sscanf(line, "HTTP/%c.%c %d%c", &junk, &junk, &status, &c) >= 3
&& (c == 0 || isspace(c))
&& status == 200) {
first = 0;
} else
return (status >= 400 && status <= 499) ? -EPERM : -EINVAL;
} else {
colon = strchr(line, ':');
if (colon) {
*colon = 0;
colon++;
while (isspace(*colon))
colon++;
get_ip_address(vpninfo, line, colon);
}
}
line = cr + 1;
}
return 1;
}