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
|
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012, Nick Zitzmann, <nickzman@gmail.com>.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/*
* Source file for all SecureTransport-specific code for the TLS/SSL layer.
* No code but sslgen.c should ever call or use these functions.
*/
#include "setup.h"
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef USE_DARWINSSL
#include <Security/Security.h>
#include <Security/SecureTransport.h>
#include <CoreFoundation/CoreFoundation.h>
#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "connect.h"
#include "select.h"
#include "sslgen.h"
#include "curl_darwinssl.h"
/* From MacTypes.h (which we can't include because it isn't present in iOS: */
#define ioErr -36
/* The following two functions were ripped from Apple sample code,
* with some modifications: */
static OSStatus SocketRead(SSLConnectionRef connection,
void *data, /* owned by
* caller, data
* RETURNED */
size_t *dataLength) /* IN/OUT */
{
UInt32 bytesToGo = *dataLength;
UInt32 initLen = bytesToGo;
UInt8 *currData = (UInt8 *)data;
int sock = *(int *)connection;
OSStatus rtn = noErr;
UInt32 bytesRead;
int rrtn;
int theErr;
*dataLength = 0;
for(;;) {
bytesRead = 0;
rrtn = read(sock, currData, bytesToGo);
if(rrtn <= 0) {
/* this is guesswork... */
theErr = errno;
if((rrtn == 0) && (theErr == 0)) {
/* try fix for iSync */
rtn = errSSLClosedGraceful;
}
else /* do the switch */
switch(theErr) {
case ENOENT:
/* connection closed */
rtn = errSSLClosedGraceful;
break;
case ECONNRESET:
rtn = errSSLClosedAbort;
break;
case EAGAIN:
rtn = errSSLWouldBlock;
break;
default:
rtn = ioErr;
break;
}
break;
}
else {
bytesRead = rrtn;
}
bytesToGo -= bytesRead;
currData += bytesRead;
if(bytesToGo == 0) {
/* filled buffer with incoming data, done */
break;
}
}
*dataLength = initLen - bytesToGo;
return rtn;
}
static OSStatus SocketWrite(SSLConnectionRef connection,
const void *data,
size_t *dataLength) /* IN/OUT */
{
UInt32 bytesSent = 0;
int sock = *(int *)connection;
int length;
UInt32 dataLen = *dataLength;
const UInt8 *dataPtr = (UInt8 *)data;
OSStatus ortn;
int theErr;
*dataLength = 0;
do {
length = write(sock,
(char*)dataPtr + bytesSent,
dataLen - bytesSent);
} while((length > 0) &&
( (bytesSent += length) < dataLen) );
if(length <= 0) {
theErr = errno;
if(theErr == EAGAIN) {
ortn = errSSLWouldBlock;
}
else {
ortn = ioErr;
}
}
else {
ortn = noErr;
}
*dataLength = bytesSent;
return ortn;
}
static CURLcode darwinssl_connect_step1(struct connectdata *conn,
int sockindex)
{
struct SessionHandle *data = conn->data;
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
bool sni = true;
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
SSLConnectionRef ssl_connection;
OSStatus err = noErr;
if(connssl->ssl_ctx)
(void)SSLDisposeContext(connssl->ssl_ctx);
err = SSLNewContext(false, &(connssl->ssl_ctx));
if(err != noErr) {
failf(data, "SSL: couldn't create a context: OSStatus %d", err);
return CURLE_OUT_OF_MEMORY;
}
/* check to see if we've been told to use an explicit SSL/TLS version */
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx, kSSLProtocolAll, false);
switch(data->set.ssl.version) {
default:
case CURL_SSLVERSION_DEFAULT:
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx,
kSSLProtocol3,
true);
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx,
kTLSProtocol1,
true);
break;
case CURL_SSLVERSION_TLSv1:
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx,
kTLSProtocol1,
true);
break;
case CURL_SSLVERSION_SSLv2:
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx,
kSSLProtocol2,
true);
break;
case CURL_SSLVERSION_SSLv3:
(void)SSLSetProtocolVersionEnabled(connssl->ssl_ctx,
kSSLProtocol3,
true);
break;
}
/* No need to load certificates here. SecureTransport uses the Keychain
* (which is also part of the Security framework) to evaluate trust. */
/* SSL always tries to verify the peer, this only says whether it should
* fail to connect if the verification fails, or if it should continue
* anyway. In the latter case the result of the verification is checked with
* SSL_get_verify_result() below. */
err = SSLSetEnableCertVerify(connssl->ssl_ctx,
data->set.ssl.verifypeer?true:false);
if(err != noErr) {
failf(data, "SSL: SSLSetEnableCertVerify() failed: OSStatus %d", err);
return CURLE_SSL_CONNECT_ERROR;
}
if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
#ifdef ENABLE_IPV6
(0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
#endif
sni) {
err = SSLSetPeerDomainName(connssl->ssl_ctx, conn->host.name,
strlen(conn->host.name));
if(err != noErr) {
infof(data, "WARNING: SSL: SSLSetPeerDomainName() failed: OSStatus %d",
err);
}
else
infof(data, "WARNING: failed to configure "
"server name indication (SNI) TLS extension\n");
}
err = SSLSetIOFuncs(connssl->ssl_ctx, SocketRead, SocketWrite);
if(err != noErr) {
failf(data, "SSL: SSLSetIOFuncs() failed: OSStatus %d", err);
return CURLE_SSL_CONNECT_ERROR;
}
/* pass the raw socket into the SSL layers */
/* We need to store the FD in a constant memory address, because
* SSLSetConnection() will not copy that address. I've found that
* conn->sock[sockindex] may change on its own. */
connssl->ssl_sockfd = sockfd;
ssl_connection = &(connssl->ssl_sockfd);
err = SSLSetConnection(connssl->ssl_ctx, ssl_connection);
if(err != noErr) {
failf(data, "SSL: SSLSetConnection() failed: %d", err);
return CURLE_SSL_CONNECT_ERROR;
}
connssl->connecting_state = ssl_connect_2;
return CURLE_OK;
}
static CURLcode
darwinssl_connect_step2(struct connectdata *conn, int sockindex)
{
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
OSStatus err;
SSLCipherSuite cipher;
DEBUGASSERT(ssl_connect_2 == connssl->connecting_state
|| ssl_connect_2_reading == connssl->connecting_state
|| ssl_connect_2_writing == connssl->connecting_state
|| ssl_connect_2_wouldblock == connssl->connecting_state);
/* Here goes nothing: */
err = SSLHandshake(connssl->ssl_ctx);
if(err != noErr) {
switch (err) {
case errSSLWouldBlock: /* they're not done with us yet */
connssl->connecting_state = ssl_connect_2_wouldblock;
return CURLE_OK;
break;
case errSSLServerAuthCompleted:
/* the documentation says we need to call SSLHandshake() again */
return darwinssl_connect_step2(conn, sockindex);
case errSSLXCertChainInvalid:
case errSSLUnknownRootCert:
case errSSLNoRootCert:
case errSSLCertExpired:
failf(data, "SSL certificate problem: OSStatus %d", err);
return CURLE_SSL_CACERT;
break;
default:
failf(data, "Unknown SSL protocol error in connection to %s:%d",
conn->host.name, err);
return CURLE_SSL_CONNECT_ERROR;
break;
}
}
else {
/* we have been connected fine, we're not waiting for anything else. */
connssl->connecting_state = ssl_connect_3;
/* Informational message */
(void)SSLGetNegotiatedCipher(connssl->ssl_ctx, &cipher);
infof (data, "SSL connection using cipher %u\n", cipher);
return CURLE_OK;
}
}
static CURLcode
darwinssl_connect_step3(struct connectdata *conn,
int sockindex)
{
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
CFStringRef server_cert_summary;
char server_cert_summary_c[128];
CFArrayRef server_certs;
SecCertificateRef server_cert;
OSStatus err;
CFIndex i, count;
/* There is no step 3!
* Well, okay, if verbose mode is on, let's print the details of the
* server certificates. */
err = SSLCopyPeerCertificates(connssl->ssl_ctx, &server_certs);
if(err == noErr) {
count = CFArrayGetCount(server_certs);
for(i = 0L ; i < count ; i++) {
server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs, i);
server_cert_summary = SecCertificateCopySubjectSummary(server_cert);
memset(server_cert_summary_c, 0, 128);
if(CFStringGetCString(server_cert_summary,
server_cert_summary_c,
128,
kCFStringEncodingUTF8)) {
infof(data, "Server certificate: %s\n", server_cert_summary_c);
}
CFRelease(server_cert_summary);
}
CFRelease(server_certs);
}
connssl->connecting_state = ssl_connect_done;
return CURLE_OK;
}
static Curl_recv darwinssl_recv;
static Curl_send darwinssl_send;
static CURLcode
darwinssl_connect_common(struct connectdata *conn,
int sockindex,
bool nonblocking,
bool *done)
{
CURLcode retcode;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
curl_socket_t sockfd = conn->sock[sockindex];
long timeout_ms;
int what;
/* check if the connection has already been established */
if(ssl_connection_complete == connssl->state) {
*done = TRUE;
return CURLE_OK;
}
if(ssl_connect_1==connssl->connecting_state) {
/* Find out how much more time we're allowed */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
retcode = darwinssl_connect_step1(conn, sockindex);
if(retcode)
return retcode;
}
while(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == connssl->connecting_state ||
ssl_connect_2_wouldblock == connssl->connecting_state) {
/* check allowed time left */
timeout_ms = Curl_timeleft(data, NULL, TRUE);
if(timeout_ms < 0) {
/* no need to continue if time already is up */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
/* if ssl is expecting something, check if it's available. */
if(connssl->connecting_state == ssl_connect_2_reading
|| connssl->connecting_state == ssl_connect_2_writing
|| connssl->connecting_state == ssl_connect_2_wouldblock) {
curl_socket_t writefd = ssl_connect_2_writing
|| ssl_connect_2_wouldblock ==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
curl_socket_t readfd = ssl_connect_2_reading
|| ssl_connect_2_wouldblock ==
connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
if(what < 0) {
/* fatal error */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
return CURLE_SSL_CONNECT_ERROR;
}
else if(0 == what) {
if(nonblocking) {
*done = FALSE;
return CURLE_OK;
}
else {
/* timeout */
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEDOUT;
}
}
/* socket is readable or writable */
}
/* Run transaction, and return to the caller if it failed or if this
* connection is done nonblocking and this loop would execute again. This
* permits the owner of a multi handle to abort a connection attempt
* before step2 has completed while ensuring that a client using select()
* or epoll() will always have a valid fdset to wait on.
*/
retcode = darwinssl_connect_step2(conn, sockindex);
if(retcode || (nonblocking &&
(ssl_connect_2 == connssl->connecting_state ||
ssl_connect_2_reading == connssl->connecting_state ||
ssl_connect_2_writing == connssl->connecting_state ||
ssl_connect_2_wouldblock == connssl->connecting_state)))
return retcode;
} /* repeat step2 until all transactions are done. */
if(ssl_connect_3==connssl->connecting_state) {
retcode = darwinssl_connect_step3(conn, sockindex);
if(retcode)
return retcode;
}
if(ssl_connect_done==connssl->connecting_state) {
connssl->state = ssl_connection_complete;
conn->recv[sockindex] = darwinssl_recv;
conn->send[sockindex] = darwinssl_send;
*done = TRUE;
}
else
*done = FALSE;
/* Reset our connect state machine */
connssl->connecting_state = ssl_connect_1;
return CURLE_OK;
}
CURLcode
Curl_darwinssl_connect_nonblocking(struct connectdata *conn,
int sockindex,
bool *done)
{
return darwinssl_connect_common(conn, sockindex, TRUE, done);
}
CURLcode
Curl_darwinssl_connect(struct connectdata *conn,
int sockindex)
{
CURLcode retcode;
bool done = FALSE;
retcode = darwinssl_connect_common(conn, sockindex, FALSE, &done);
if(retcode)
return retcode;
DEBUGASSERT(done);
return CURLE_OK;
}
void Curl_darwinssl_close(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
(void)SSLClose(connssl->ssl_ctx);
(void)SSLDisposeContext(connssl->ssl_ctx);
connssl->ssl_ctx = NULL;
connssl->ssl_sockfd = 0;
}
void Curl_darwinssl_close_all(struct SessionHandle *data)
{
/* SecureTransport doesn't separate sessions from contexts, so... */
(void)data;
}
int Curl_darwinssl_shutdown(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct SessionHandle *data = conn->data;
ssize_t nread;
int what;
int rc;
char buf[120];
if(!connssl->ssl_ctx)
return 0;
if(data->set.ftp_ccc != CURLFTPSSL_CCC_ACTIVE)
return 0;
Curl_darwinssl_close(conn, sockindex);
rc = 0;
what = Curl_socket_ready(conn->sock[sockindex],
CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);
for(;;) {
if(what < 0) {
/* anything that gets here is fatally bad */
failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
rc = -1;
break;
}
if(!what) { /* timeout */
failf(data, "SSL shutdown timeout");
break;
}
/* Something to read, let's do it and hope that it is the close
notify alert from the server. No way to SSL_Read now, so use read(). */
nread = read(conn->sock[sockindex], buf, sizeof(buf));
if(nread < 0) {
failf(data, "read: %s", strerror(errno));
rc = -1;
}
if(nread <= 0)
break;
what = Curl_socket_ready(conn->sock[sockindex], CURL_SOCKET_BAD, 0);
}
return rc;
}
size_t Curl_darwinssl_version(char *buffer, size_t size)
{
return snprintf(buffer, size, "SecureTransport");
}
/*
* This function uses SSLGetSessionState to determine connection status.
*
* Return codes:
* 1 means the connection is still in place
* 0 means the connection has been closed
* -1 means the connection status is unknown
*/
int Curl_darwinssl_check_cxn(struct connectdata *conn)
{
struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
OSStatus err;
SSLSessionState state;
if(connssl->ssl_ctx) {
err = SSLGetSessionState(connssl->ssl_ctx, &state);
if(err == noErr)
return state == kSSLConnected || state == kSSLHandshake;
return -1;
}
return 0;
}
bool Curl_darwinssl_data_pending(const struct connectdata *conn,
int connindex)
{
const struct ssl_connect_data *connssl = &conn->ssl[connindex];
OSStatus err;
size_t buffer;
if(connssl->ssl_ctx) { /* SSL is in use */
err = SSLGetBufferedReadSize(connssl->ssl_ctx, &buffer);
if(err == noErr)
return buffer > 0UL;
return false;
}
else
return false;
}
static ssize_t darwinssl_send(struct connectdata *conn,
int sockindex,
const void *mem,
size_t len,
CURLcode *curlcode)
{
/*struct SessionHandle *data = conn->data;*/
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
size_t processed;
OSStatus err = SSLWrite(connssl->ssl_ctx, mem, len, &processed);
if(err != noErr) {
switch (err) {
case errSSLWouldBlock: /* we're not done yet; keep sending */
*curlcode = CURLE_AGAIN;
return -1;
break;
default:
failf(conn->data, "SSLWrite() return error %d", err);
*curlcode = CURLE_SEND_ERROR;
return -1;
break;
}
}
return (ssize_t)processed;
}
static ssize_t darwinssl_recv(struct connectdata *conn,
int num,
char *buf,
size_t buffersize,
CURLcode *curlcode)
{
/*struct SessionHandle *data = conn->data;*/
struct ssl_connect_data *connssl = &conn->ssl[num];
size_t processed;
OSStatus err = SSLRead(connssl->ssl_ctx, buf, buffersize, &processed);
if(err != noErr) {
switch (err) {
case errSSLWouldBlock: /* we're not done yet; keep reading */
*curlcode = CURLE_AGAIN;
return -1;
break;
default:
failf(conn->data, "SSLRead() return error %d", err);
*curlcode = CURLE_RECV_ERROR;
return -1;
break;
}
}
return (ssize_t)processed;
}
#endif /* USE_DARWINSSL */
|