forked from brandt/openconnect
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathssl.c
1157 lines (1012 loc) · 28.7 KB
/
ssl.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
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2015 Intel Corporation.
*
* Author: David Woodhouse <[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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#if defined(__linux__) || defined(__ANDROID__)
#include <sys/vfs.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__) || defined(__APPLE__)
#include <sys/param.h>
#include <sys/mount.h>
#elif defined(__sun__) || defined(__NetBSD__) || defined(__DragonFly__)
#include <sys/statvfs.h>
#elif defined(__GNU__)
#include <sys/statfs.h>
#endif
#include "openconnect-internal.h"
#ifdef ANDROID_KEYSTORE
#include <sys/un.h>
#endif
/* OSX < 1.6 doesn't have AI_NUMERICSERV */
#ifndef AI_NUMERICSERV
#define AI_NUMERICSERV 0
#endif
/* GNU Hurd doesn't yet declare IPV6_TCLASS */
#ifndef IPV6_TCLASS
#if defined(__GNU__)
#define IPV6_TCLASS 61
#elif defined(__APPLE__)
#define IPV6_TCLASS 36
#endif
#endif
static inline int connect_pending()
{
#ifdef _WIN32
return WSAGetLastError() == WSAEWOULDBLOCK;
#else
return errno == EINPROGRESS;
#endif
}
/* Windows is interminably horrid, and has disjoint errno spaces.
* So if we return a positive value, that's a WSA Error and should
* be handled with openconnect__win32_strerror(). But if we return a
* negative value, that's a normal errno and should be handled with
* strerror(). No, you can't just pass the latter value (negated) to
* openconnect__win32_strerror() because it gives nonsense results. */
static int cancellable_connect(struct openconnect_info *vpninfo, int sockfd,
const struct sockaddr *addr, socklen_t addrlen)
{
struct sockaddr_storage peer;
socklen_t peerlen = sizeof(peer);
fd_set wr_set, rd_set, ex_set;
int maxfd = sockfd;
int err;
set_sock_nonblock(sockfd);
if (vpninfo->protect_socket)
vpninfo->protect_socket(vpninfo->cbdata, sockfd);
if (connect(sockfd, addr, addrlen) < 0 && !connect_pending()) {
#ifdef _WIN32
return WSAGetLastError();
#else
return -errno;
#endif
}
do {
FD_ZERO(&wr_set);
FD_ZERO(&rd_set);
FD_ZERO(&ex_set);
FD_SET(sockfd, &wr_set);
#ifdef _WIN32 /* Windows indicates failure this way, not in wr_set */
FD_SET(sockfd, &ex_set);
#endif
cmd_fd_set(vpninfo, &rd_set, &maxfd);
select(maxfd + 1, &rd_set, &wr_set, &ex_set, NULL);
if (is_cancel_pending(vpninfo, &rd_set)) {
vpn_progress(vpninfo, PRG_ERR, _("Socket connect cancelled\n"));
return -EINTR;
}
} while (!FD_ISSET(sockfd, &wr_set) && !FD_ISSET(sockfd, &ex_set) &&
!vpninfo->got_pause_cmd);
/* Check whether connect() succeeded or failed by using
getpeername(). See http://cr.yp.to/docs/connect.html */
if (!getpeername(sockfd, (void *)&peer, &peerlen))
return 0;
#ifdef _WIN32 /* On Windows, use getsockopt() to determine the error.
* We don't ddo this on Windows because it just reports
* -ENOTCONN, which we already knew. */
err = WSAGetLastError();
if (err == WSAENOTCONN) {
socklen_t errlen = sizeof(err);
getsockopt(sockfd, SOL_SOCKET, SO_ERROR,
(void *)&err, &errlen);
}
#else
err = -errno;
if (err == -ENOTCONN) {
int ch;
if (read(sockfd, &ch, 1) < 0)
err = -errno;
/* It should *always* fail! */
}
#endif
return err;
}
/* checks whether the provided string is an IP or a hostname.
*/
unsigned string_is_hostname(const char *str)
{
struct in_addr buf;
/* We don't use inet_pton() because an IPv6 literal is likely to
be encased in []. So just check for a colon, which shouldn't
occur in hostnames anyway. */
if (!str || inet_aton(str, &buf) || strchr(str, ':'))
return 0;
return 1;
}
static int match_sockaddr(struct sockaddr *a, struct sockaddr *b)
{
if (a->sa_family == AF_INET) {
struct sockaddr_in *a4 = (void *)a;
struct sockaddr_in *b4 = (void *)b;
return (a4->sin_addr.s_addr == b4->sin_addr.s_addr) &&
(a4->sin_port == b4->sin_port);
} else if (a->sa_family == AF_INET6) {
struct sockaddr_in6 *a6 = (void *)a;
struct sockaddr_in6 *b6 = (void *)b;
return !memcmp(&a6->sin6_addr, &b6->sin6_addr, sizeof(a6->sin6_addr)) &&
a6->sin6_port == b6->sin6_port;
} else
return 0;
}
int connect_https_socket(struct openconnect_info *vpninfo)
{
int ssl_sock = -1;
int err;
if (!vpninfo->port)
vpninfo->port = 443;
/* If we're talking to a server which told us it has dynamic DNS, don't
just re-use its previous IP address. If we're talking to a proxy, we
can use *its* previous IP address. We expect it'll re-do the DNS
lookup for the server anyway. */
if (vpninfo->peer_addr && (!vpninfo->is_dyndns || vpninfo->proxy)) {
reconnect:
#ifdef SOCK_CLOEXEC
ssl_sock = socket(vpninfo->peer_addr->sa_family, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_IP);
if (ssl_sock < 0)
#endif
{
ssl_sock = socket(vpninfo->peer_addr->sa_family, SOCK_STREAM, IPPROTO_IP);
if (ssl_sock < 0) {
#ifdef _WIN32
err = WSAGetLastError();
#else
err = -errno;
#endif
goto reconn_err;
}
set_fd_cloexec(ssl_sock);
}
err = cancellable_connect(vpninfo, ssl_sock, vpninfo->peer_addr, vpninfo->peer_addrlen);
if (err) {
char *errstr;
reconn_err:
#ifdef _WIN32
if (err > 0)
errstr = openconnect__win32_strerror(err);
else
#endif
errstr = strerror(-err);
if (vpninfo->proxy) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to reconnect to proxy %s: %s\n"),
vpninfo->proxy, errstr);
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to reconnect to host %s: %s\n"),
vpninfo->hostname, errstr);
}
#ifdef _WIN32
if (err > 0)
free(errstr);
#endif
if (ssl_sock >= 0)
closesocket(ssl_sock);
ssl_sock = -EINVAL;
goto out;
}
} else {
struct addrinfo hints, *result, *rp;
char *hostname;
char port[6];
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
hints.ai_protocol = 0;
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
/* The 'port' variable is a string because it's easier
this way than if we pass NULL to getaddrinfo() and
then try to fill in the numeric value into
different types of returned sockaddr_in{6,}. */
#ifdef LIBPROXY_HDR
if (vpninfo->proxy_factory) {
struct oc_text_buf *url_buf = buf_alloc();
char **proxies;
int i = 0;
free(vpninfo->proxy_type);
vpninfo->proxy_type = NULL;
free(vpninfo->proxy);
vpninfo->proxy = NULL;
buf_append(url_buf, "https://%s", vpninfo->hostname);
if (vpninfo->port != 443)
buf_append(url_buf, ":%d", vpninfo->port);
buf_append(url_buf, "/%s", vpninfo->urlpath?:"");
if (buf_error(url_buf)) {
buf_free(url_buf);
ssl_sock = -ENOMEM;
goto out;
}
proxies = px_proxy_factory_get_proxies(vpninfo->proxy_factory,
url_buf->data);
i = 0;
while (proxies && proxies[i]) {
if (!vpninfo->proxy &&
(!strncmp(proxies[i], "http://", 7) ||
!strncmp(proxies[i], "socks://", 8) ||
!strncmp(proxies[i], "socks5://", 9)))
internal_parse_url(proxies[i], &vpninfo->proxy_type,
&vpninfo->proxy, &vpninfo->proxy_port,
NULL, 0);
i++;
}
buf_free(url_buf);
free(proxies);
if (vpninfo->proxy)
vpn_progress(vpninfo, PRG_DEBUG,
_("Proxy from libproxy: %s://%s:%d/\n"),
vpninfo->proxy_type, vpninfo->proxy, vpninfo->port);
}
#endif
if (vpninfo->proxy) {
hostname = vpninfo->proxy;
snprintf(port, 6, "%d", vpninfo->proxy_port);
} else {
hostname = vpninfo->hostname;
snprintf(port, 6, "%d", vpninfo->port);
}
if (hostname[0] == '[' && hostname[strlen(hostname)-1] == ']') {
hostname = strndup(hostname + 1, strlen(hostname) - 2);
if (!hostname) {
ssl_sock = -ENOMEM;
goto out;
}
hints.ai_flags |= AI_NUMERICHOST;
}
if (vpninfo->getaddrinfo_override)
err = vpninfo->getaddrinfo_override(vpninfo->cbdata, hostname, port, &hints, &result);
else
err = getaddrinfo(hostname, port, &hints, &result);
if (err) {
vpn_progress(vpninfo, PRG_ERR,
_("getaddrinfo failed for host '%s': %s\n"),
hostname, gai_strerror(err));
if (hints.ai_flags & AI_NUMERICHOST)
free(hostname);
ssl_sock = -EINVAL;
/* If we were just retrying for dynamic DNS, reconnct using
the previously-known IP address */
if (vpninfo->peer_addr) {
vpn_progress(vpninfo, PRG_ERR,
_("Reconnecting to DynDNS server using previously cached IP address\n"));
goto reconnect;
}
goto out;
}
if (hints.ai_flags & AI_NUMERICHOST)
free(hostname);
for (rp = result; rp ; rp = rp->ai_next) {
char host[80];
host[0] = 0;
if (!getnameinfo(rp->ai_addr, rp->ai_addrlen, host,
sizeof(host), NULL, 0, NI_NUMERICHOST))
vpn_progress(vpninfo, PRG_DEBUG, vpninfo->proxy_type ?
_("Attempting to connect to proxy %s%s%s:%s\n") :
_("Attempting to connect to server %s%s%s:%s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port);
ssl_sock = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
if (ssl_sock < 0)
continue;
set_fd_cloexec(ssl_sock);
err = cancellable_connect(vpninfo, ssl_sock, rp->ai_addr, rp->ai_addrlen);
if (!err) {
/* Store the peer address we actually used, so that DTLS can
use it again later */
free(vpninfo->ip_info.gateway_addr);
vpninfo->ip_info.gateway_addr = NULL;
if (host[0]) {
vpninfo->ip_info.gateway_addr = strdup(host);
vpn_progress(vpninfo, PRG_INFO, _("Connected to %s%s%s:%s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port);
}
free(vpninfo->peer_addr);
vpninfo->peer_addrlen = 0;
vpninfo->peer_addr = malloc(rp->ai_addrlen);
if (!vpninfo->peer_addr) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to allocate sockaddr storage\n"));
closesocket(ssl_sock);
ssl_sock = -ENOMEM;
goto out;
}
vpninfo->peer_addrlen = rp->ai_addrlen;
memcpy(vpninfo->peer_addr, rp->ai_addr, rp->ai_addrlen);
/* If no proxy, ensure that we output *this* IP address in
* authentication results because we're going to need to
* reconnect to the *same* server from the rotation. And with
* some trick DNS setups, it might possibly be a "rotation"
* even if we only got one result from getaddrinfo() this
* time.
*
* If there's a proxy, we're kind of screwed; we can't know
* which IP address we connected to. Perhaps we ought to do
* the DNS lookup locally and connect to a specific IP? */
if (!vpninfo->proxy && host[0]) {
char *p = malloc(strlen(host) + 3);
if (p) {
free(vpninfo->unique_hostname);
vpninfo->unique_hostname = p;
if (rp->ai_family == AF_INET6)
*p++ = '[';
memcpy(p, host, strlen(host));
p += strlen(host);
if (rp->ai_family == AF_INET6)
*p++ = ']';
*p = 0;
}
}
break;
}
if (host[0]) {
char *errstr;
#ifdef _WIN32
if (err > 0)
errstr = openconnect__win32_strerror(err);
else
#endif
errstr = strerror(-err);
vpn_progress(vpninfo, PRG_INFO, _("Failed to connect to %s%s%s:%s: %s\n"),
rp->ai_family == AF_INET6 ? "[" : "",
host,
rp->ai_family == AF_INET6 ? "]" : "",
port, errstr);
#ifdef _WIN32
if (err > 0)
free(errstr);
#endif
}
closesocket(ssl_sock);
ssl_sock = -1;
/* If we're in DynDNS mode but this *was* the cached IP address,
* don't bother falling back to it if it didn't work. */
if (vpninfo->peer_addr && vpninfo->peer_addrlen == rp->ai_addrlen &&
match_sockaddr(vpninfo->peer_addr, rp->ai_addr)) {
vpn_progress(vpninfo, PRG_TRACE,
_("Forgetting non-functional previous peer address\n"));
free(vpninfo->peer_addr);
vpninfo->peer_addr = 0;
vpninfo->peer_addrlen = 0;
free(vpninfo->ip_info.gateway_addr);
vpninfo->ip_info.gateway_addr = NULL;
}
}
freeaddrinfo(result);
if (ssl_sock < 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to connect to host %s\n"),
vpninfo->proxy?:vpninfo->hostname);
ssl_sock = -EINVAL;
if (vpninfo->peer_addr) {
vpn_progress(vpninfo, PRG_ERR,
_("Reconnecting to DynDNS server using previously cached IP address\n"));
goto reconnect;
}
goto out;
}
}
if (vpninfo->proxy) {
err = process_proxy(vpninfo, ssl_sock);
if (err) {
closesocket(ssl_sock);
if (err == -EAGAIN) {
/* Proxy authentication failed and we need to retry */
vpn_progress(vpninfo, PRG_DEBUG,
_("Reconnecting to proxy %s\n"), vpninfo->proxy);
goto reconnect;
}
ssl_sock = err;
}
}
out:
/* If proxy processing returned -EAGAIN to reconnect before attempting
further auth, and we failed to reconnect, we have to clean up here. */
clear_auth_states(vpninfo, vpninfo->proxy_auth, 1);
return ssl_sock;
}
int __attribute__ ((format (printf, 2, 3)))
openconnect_SSL_printf(struct openconnect_info *vpninfo, const char *fmt, ...)
{
char buf[1024];
va_list args;
buf[1023] = 0;
va_start(args, fmt);
vsnprintf(buf, 1023, fmt, args);
va_end(args);
return vpninfo->ssl_write(vpninfo, buf, strlen(buf));
}
int __attribute__ ((format(printf, 4, 5)))
request_passphrase(struct openconnect_info *vpninfo, const char *label,
char **response, const char *fmt, ...)
{
struct oc_auth_form f;
struct oc_form_opt o;
char buf[1024];
va_list args;
int ret;
buf[1023] = 0;
memset(&f, 0, sizeof(f));
va_start(args, fmt);
vsnprintf(buf, 1023, fmt, args);
va_end(args);
f.auth_id = (char *)label;
f.opts = &o;
o.next = NULL;
o.type = OC_FORM_OPT_PASSWORD;
o.name = (char *)label;
o.label = buf;
o._value = NULL;
ret = process_auth_form(vpninfo, &f);
if (!ret) {
*response = o._value;
return 0;
}
return -EIO;
}
#if defined(__sun__) || defined(__NetBSD__) || defined(__DragonFly__)
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
struct statvfs buf;
char *sslkey = openconnect_utf8_to_legacy(vpninfo, vpninfo->sslkey);
int err = 0;
if (statvfs(sslkey, &buf)) {
err = -errno;
vpn_progress(vpninfo, PRG_ERR, _("statvfs: %s\n"),
strerror(errno));
} else if (asprintf(&vpninfo->cert_password, "%lx", buf.f_fsid) == -1)
err = -ENOMEM;
if (sslkey != vpninfo->sslkey)
free(sslkey);
return err;
}
#elif defined(_WIN32)
#include <fileapi.h>
typedef BOOL WINAPI (*GVIBH)(HANDLE, LPWSTR, DWORD, LPDWORD, LPDWORD, LPDWORD, LPWSTR, DWORD);
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
HANDLE h;
DWORD serial;
HINSTANCE kernlib;
GVIBH func = NULL;
int success;
int fd;
/* Some versions of Windows don't have this so don't use standard
load-time linking or it'll cause failures. */
kernlib = LoadLibraryA("Kernel32.dll");
if (!kernlib) {
notsupp:
vpn_progress(vpninfo, PRG_ERR,
_("Could not obtain file system ID for passphrase\n"));
return -EOPNOTSUPP;
}
func = (GVIBH)GetProcAddress(kernlib, "GetVolumeInformationByHandleW");
FreeLibrary(kernlib);
if (!func)
goto notsupp;
fd = openconnect_open_utf8(vpninfo, vpninfo->sslkey, O_RDONLY);
if (fd == -1) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to open private key file '%s': %s\n"),
vpninfo->sslkey, strerror(errno));
return -ENOENT;
}
h = (HANDLE)_get_osfhandle(fd);
success = func(h, NULL, 0, &serial, NULL, NULL, NULL, 0);
close(fd);
if (!success)
return -EIO;
if (asprintf(&vpninfo->cert_password, "%lx", serial) == -1)
return -ENOMEM;
return 0;
}
#elif defined(HAVE_STATFS)
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
char *sslkey = openconnect_utf8_to_legacy(vpninfo, vpninfo->sslkey);
struct statfs buf;
unsigned *fsid = (unsigned *)&buf.f_fsid;
unsigned long long fsid64;
int err = 0;
if (statfs(sslkey, &buf)) {
err = -errno;
vpn_progress(vpninfo, PRG_ERR, _("statfs: %s\n"),
strerror(errno));
return -err;
} else {
fsid64 = ((unsigned long long)fsid[0] << 32) | fsid[1];
if (asprintf(&vpninfo->cert_password, "%llx", fsid64) == -1)
err = -ENOMEM;
}
if (sslkey != vpninfo->sslkey)
free(sslkey);
return err;
}
#else
int openconnect_passphrase_from_fsid(struct openconnect_info *vpninfo)
{
return -EOPNOTSUPP;
}
#endif
#if defined(OPENCONNECT_OPENSSL)
/* We put this here rather than in openssl.c because it might be needed
for OpenSSL DTLS support even when GnuTLS is being used for HTTPS */
int openconnect_print_err_cb(const char *str, size_t len, void *ptr)
{
struct openconnect_info *vpninfo = ptr;
vpn_progress(vpninfo, PRG_ERR, "%s", str);
return 0;
}
#endif
#ifdef FAKE_ANDROID_KEYSTORE
char *keystore_strerror(int err)
{
return (char *)strerror(-err);
}
int keystore_fetch(const char *key, unsigned char **result)
{
unsigned char *data;
struct stat st;
int fd;
int ret;
fd = open(key, O_RDONLY);
if (fd < 0)
return -errno;
if (fstat(fd, &st)) {
ret = -errno;
goto out_fd;
}
data = malloc(st.st_size + 1);
if (!data) {
ret = -ENOMEM;
goto out_fd;
}
if (read(fd, data, st.st_size) != st.st_size) {
ret = -EIO;
free(data);
goto out_fd;
}
data[st.st_size] = 0;
*result = data;
ret = st.st_size;
out_fd:
close(fd);
return ret;
}
#elif defined(ANDROID_KEYSTORE)
/* keystore.h isn't in the NDK so we need to define these */
#define NO_ERROR 1
#define LOCKED 2
#define UNINITIALIZED 3
#define SYSTEM_ERROR 4
#define PROTOCOL_ERROR 5
#define PERMISSION_DENIED 6
#define KEY_NOT_FOUND 7
#define VALUE_CORRUPTED 8
#define UNDEFINED_ACTION 9
#define WRONG_PASSWORD 10
const char *keystore_strerror(int err)
{
switch (-err) {
case NO_ERROR: return _("No error");
case LOCKED: return _("Keystore locked");
case UNINITIALIZED: return _("Keystore uninitialized");
case SYSTEM_ERROR: return _("System error");
case PROTOCOL_ERROR: return _("Protocol error");
case PERMISSION_DENIED: return _("Permission denied");
case KEY_NOT_FOUND: return _("Key not found");
case VALUE_CORRUPTED: return _("Value corrupted");
case UNDEFINED_ACTION: return _("Undefined action");
case WRONG_PASSWORD:
case WRONG_PASSWORD+1:
case WRONG_PASSWORD+2:
case WRONG_PASSWORD+3: return _("Wrong password");
default: return _("Unknown error");
}
}
/* Returns length, or a negative errno in its own namespace (handled by its
own strerror function above). The numbers are from Android's keystore.h */
int keystore_fetch(const char *key, unsigned char **result)
{
struct sockaddr_un sa = { AF_UNIX, "/dev/socket/keystore" };
socklen_t sl = offsetof(struct sockaddr_un, sun_path) + strlen(sa.sun_path) + 1;
unsigned char *data, *p;
unsigned char buf[3];
int len, fd;
int ret = -SYSTEM_ERROR;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -SYSTEM_ERROR;
if (connect(fd, (void *)&sa, sl)) {
close(fd);
return -SYSTEM_ERROR;
}
len = strlen(key);
buf[0] = 'g';
store_be16(buf + 1, len);
if (send(fd, buf, 3, 0) != 3 || send(fd, key, len, 0) != len ||
shutdown(fd, SHUT_WR) || recv(fd, buf, 1, 0) != 1)
goto out;
if (buf[0] != NO_ERROR) {
/* Should never be zero */
ret = buf[0] ? -buf[0] : -PROTOCOL_ERROR;
goto out;
}
if (recv(fd, buf, 2, 0) != 2)
goto out;
len = load_be16(buf);
data = malloc(len);
if (!data)
goto out;
p = data;
ret = len;
while (len) {
int got = recv(fd, p, len, 0);
if (got <= 0) {
free(data);
ret = -PROTOCOL_ERROR;
goto out;
}
len -= got;
p += got;
}
*result = data;
out:
close(fd);
return ret;
}
#endif
void cmd_fd_set(struct openconnect_info *vpninfo, fd_set *fds, int *maxfd)
{
if (vpninfo->cmd_fd != -1) {
FD_SET(vpninfo->cmd_fd, fds);
if (vpninfo->cmd_fd > *maxfd)
*maxfd = vpninfo->cmd_fd;
}
}
void check_cmd_fd(struct openconnect_info *vpninfo, fd_set *fds)
{
char cmd;
if (vpninfo->cmd_fd == -1 || !FD_ISSET(vpninfo->cmd_fd, fds))
return;
if (vpninfo->cmd_fd_write == -1) {
/* legacy openconnect_set_cancel_fd() users */
vpninfo->got_cancel_cmd = 1;
return;
}
#ifdef _WIN32
if (recv(vpninfo->cmd_fd, &cmd, 1, 0) != 1)
return;
#else
if (read(vpninfo->cmd_fd, &cmd, 1) != 1)
return;
#endif
switch (cmd) {
case OC_CMD_CANCEL:
case OC_CMD_DETACH:
vpninfo->got_cancel_cmd = 1;
vpninfo->cancel_type = cmd;
break;
case OC_CMD_PAUSE:
vpninfo->got_pause_cmd = 1;
break;
case OC_CMD_STATS:
if (vpninfo->stats_handler)
vpninfo->stats_handler(vpninfo->cbdata, &vpninfo->stats);
}
}
int is_cancel_pending(struct openconnect_info *vpninfo, fd_set *fds)
{
check_cmd_fd(vpninfo, fds);
return vpninfo->got_cancel_cmd || vpninfo->got_pause_cmd;
}
void poll_cmd_fd(struct openconnect_info *vpninfo, int timeout)
{
fd_set rd_set;
int maxfd = 0;
time_t expiration = time(NULL) + timeout, now = 0;
while (now < expiration && !vpninfo->got_cancel_cmd && !vpninfo->got_pause_cmd) {
struct timeval tv;
now = time(NULL);
tv.tv_sec = now >= expiration ? 0 : expiration - now;
tv.tv_usec = 0;
FD_ZERO(&rd_set);
cmd_fd_set(vpninfo, &rd_set, &maxfd);
select(maxfd + 1, &rd_set, NULL, NULL, &tv);
check_cmd_fd(vpninfo, &rd_set);
}
}
#ifdef _WIN32
#include <io.h>
#include <sys/stat.h>
int openconnect_open_utf8(struct openconnect_info *vpninfo, const char *fname, int mode)
{
wchar_t *fname_w;
int nr_chars = MultiByteToWideChar(CP_UTF8, 0, fname, -1, NULL, 0);
int fd;
if (!nr_chars) {
errno = EINVAL;
return -1;
}
fname_w = malloc(nr_chars * sizeof(wchar_t));
if (!fname_w) {
errno = ENOMEM;
return -1;
}
MultiByteToWideChar(CP_UTF8, 0, fname, -1, fname_w, nr_chars);
fd = _wopen(fname_w, mode, _S_IREAD | _S_IWRITE);
free(fname_w);
return fd;
}
#else
int openconnect_open_utf8(struct openconnect_info *vpninfo, const char *fname, int mode)
{
char *legacy_fname = openconnect_utf8_to_legacy(vpninfo, fname);
int fd;
fd = open(legacy_fname, mode, 0644);
if (legacy_fname != fname)
free(legacy_fname);
return fd;
}
#endif
FILE *openconnect_fopen_utf8(struct openconnect_info *vpninfo, const char *fname,
const char *mode)
{
int fd;
int flags;
if (!strcmp(mode, "r"))
flags = O_RDONLY|O_CLOEXEC;
else if (!strcmp(mode, "rb"))
flags = O_RDONLY|O_CLOEXEC|O_BINARY;
else if (!strcmp(mode, "w"))
flags = O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC;
else if (!strcmp(mode, "wb"))
flags = O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC|O_BINARY;
else {
/* This should never happen, but if we forget and start using other
modes without implementing proper mode->flags conversion, complain! */
vpn_progress(vpninfo, PRG_ERR,
_("openconnect_fopen_utf8() used with unsupported mode '%s'\n"),
mode);
return NULL;
}
fd = openconnect_open_utf8(vpninfo, fname, flags);
if (fd == -1)
return NULL;
return fdopen(fd, mode);
}
int udp_sockaddr(struct openconnect_info *vpninfo, int port)
{
free(vpninfo->dtls_addr);
vpninfo->dtls_addr = malloc(vpninfo->peer_addrlen);
if (!vpninfo->dtls_addr)
return -ENOMEM;
memcpy(vpninfo->dtls_addr, vpninfo->peer_addr, vpninfo->peer_addrlen);
if (vpninfo->peer_addr->sa_family == AF_INET) {
struct sockaddr_in *sin = (void *)vpninfo->dtls_addr;
sin->sin_port = htons(port);
vpninfo->dtls_tos_proto = IPPROTO_IP;
vpninfo->dtls_tos_optname = IP_TOS;
} else if (vpninfo->peer_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin = (void *)vpninfo->dtls_addr;
sin->sin6_port = htons(port);
#if defined(IPV6_TCLASS)
vpninfo->dtls_tos_proto = IPPROTO_IPV6;
vpninfo->dtls_tos_optname = IPV6_TCLASS;
#endif
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Unknown protocol family %d. Cannot create UDP server address\n"),
vpninfo->peer_addr->sa_family);
return -EINVAL;
}
/* in case DTLS TOS copy is disabled, reset the optname value */
/* so that the copy won't be applied in dtls.c / dtls_mainloop() */
if (!vpninfo->dtls_pass_tos)
vpninfo->dtls_tos_optname = 0;
return 0;
}
int udp_connect(struct openconnect_info *vpninfo)
{
int fd, sndbuf;
fd = socket(vpninfo->peer_addr->sa_family, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0) {
vpn_perror(vpninfo, _("Open UDP socket"));
return -EINVAL;
}
if (vpninfo->protect_socket)
vpninfo->protect_socket(vpninfo->cbdata, fd);
sndbuf = vpninfo->ip_info.mtu * 2;
setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (void *)&sndbuf, sizeof(sndbuf));
if (vpninfo->dtls_local_port) {
union {
struct sockaddr_in in;
struct sockaddr_in6 in6;
} dtls_bind_addr;
int dtls_bind_addrlen;
memset(&dtls_bind_addr, 0, sizeof(dtls_bind_addr));
if (vpninfo->peer_addr->sa_family == AF_INET) {
struct sockaddr_in *addr = &dtls_bind_addr.in;
dtls_bind_addrlen = sizeof(*addr);
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
addr->sin_port = htons(vpninfo->dtls_local_port);
} else if (vpninfo->peer_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *addr = &dtls_bind_addr.in6;
dtls_bind_addrlen = sizeof(*addr);
addr->sin6_family = AF_INET6;
addr->sin6_addr = in6addr_any;
addr->sin6_port = htons(vpninfo->dtls_local_port);
} else {
vpn_progress(vpninfo, PRG_ERR,
_("Unknown protocol family %d. Cannot use UDP transport\n"),
vpninfo->peer_addr->sa_family);
vpninfo->dtls_attempt_period = 0;
closesocket(fd);
return -EINVAL;
}
if (bind(fd, (struct sockaddr *)&dtls_bind_addr, dtls_bind_addrlen)) {
vpn_perror(vpninfo, _("Bind UDP socket"));
closesocket(fd);
return -EINVAL;
}
}
if (connect(fd, vpninfo->dtls_addr, vpninfo->peer_addrlen)) {
vpn_perror(vpninfo, _("Connect UDP socket\n"));
closesocket(fd);
return -EINVAL;
}