summaryrefslogtreecommitdiffstats
path: root/Modules/_ssl.c
blob: 906138da71ad0f36ed8c796ba2db8e3e51fd3b6a (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
/* SSL socket module

   SSL support based on patches by Brian E Gallew and Laszlo Kovacs.
   Re-worked a bit by Bill Janssen to add server-side support and
   certificate decoding.  Chris Stawarz contributed some non-blocking
   patches.

   This module is imported by ssl.py. It should *not* be used
   directly.

   XXX should partial writes be enabled, SSL_MODE_ENABLE_PARTIAL_WRITE?

   XXX what about SSL_MODE_AUTO_RETRY?
*/

#include "Python.h"

#ifdef WITH_THREAD
#include "pythread.h"
#define PySSL_BEGIN_ALLOW_THREADS { \
			PyThreadState *_save = NULL;  \
			if (_ssl_locks_count>0) {_save = PyEval_SaveThread();}
#define PySSL_BLOCK_THREADS	if (_ssl_locks_count>0){PyEval_RestoreThread(_save)};
#define PySSL_UNBLOCK_THREADS	if (_ssl_locks_count>0){_save = PyEval_SaveThread()};
#define PySSL_END_ALLOW_THREADS	if (_ssl_locks_count>0){PyEval_RestoreThread(_save);} \
		 }

#else	/* no WITH_THREAD */

#define PySSL_BEGIN_ALLOW_THREADS
#define PySSL_BLOCK_THREADS
#define PySSL_UNBLOCK_THREADS
#define PySSL_END_ALLOW_THREADS

#endif

enum py_ssl_error {
	/* these mirror ssl.h */
	PY_SSL_ERROR_NONE,
	PY_SSL_ERROR_SSL,
	PY_SSL_ERROR_WANT_READ,
	PY_SSL_ERROR_WANT_WRITE,
	PY_SSL_ERROR_WANT_X509_LOOKUP,
	PY_SSL_ERROR_SYSCALL,     /* look at error stack/return value/errno */
	PY_SSL_ERROR_ZERO_RETURN,
	PY_SSL_ERROR_WANT_CONNECT,
	/* start of non ssl.h errorcodes */
	PY_SSL_ERROR_EOF,         /* special case of SSL_ERROR_SYSCALL */
        PY_SSL_ERROR_NO_SOCKET,   /* socket has been GC'd */
	PY_SSL_ERROR_INVALID_ERROR_CODE
};

enum py_ssl_server_or_client {
	PY_SSL_CLIENT,
	PY_SSL_SERVER
};

enum py_ssl_cert_requirements {
	PY_SSL_CERT_NONE,
	PY_SSL_CERT_OPTIONAL,
	PY_SSL_CERT_REQUIRED
};

enum py_ssl_version {
	PY_SSL_VERSION_SSL2,
	PY_SSL_VERSION_SSL3,
	PY_SSL_VERSION_SSL23,
	PY_SSL_VERSION_TLS1,
};

/* Include symbols from _socket module */
#include "socketmodule.h"

static PySocketModule_APIObject PySocketModule;

#if defined(HAVE_POLL_H)
#include <poll.h>
#elif defined(HAVE_SYS_POLL_H)
#include <sys/poll.h>
#endif

/* Include OpenSSL header files */
#include "openssl/rsa.h"
#include "openssl/crypto.h"
#include "openssl/x509.h"
#include "openssl/x509v3.h"
#include "openssl/pem.h"
#include "openssl/ssl.h"
#include "openssl/err.h"
#include "openssl/rand.h"

/* SSL error object */
static PyObject *PySSLErrorObject;

#ifdef WITH_THREAD

/* serves as a flag to see whether we've initialized the SSL thread support. */
/* 0 means no, greater than 0 means yes */

static unsigned int _ssl_locks_count = 0;

#endif /* def WITH_THREAD */

/* SSL socket object */

#define X509_NAME_MAXLEN 256

/* RAND_* APIs got added to OpenSSL in 0.9.5 */
#if OPENSSL_VERSION_NUMBER >= 0x0090500fL
# define HAVE_OPENSSL_RAND 1
#else
# undef HAVE_OPENSSL_RAND
#endif

typedef struct {
	PyObject_HEAD
	PyObject        *Socket;	/* weakref to socket on which we're layered */
	SSL_CTX*	ctx;
	SSL*		ssl;
	X509*		peer_cert;

} PySSLObject;

static PyTypeObject PySSL_Type;
static PyObject *PySSL_SSLwrite(PySSLObject *self, PyObject *args);
static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args);
static int check_socket_and_wait_for_timeout(PySocketSockObject *s,
					     int writing);
static PyObject *PySSL_peercert(PySSLObject *self, PyObject *args);
static PyObject *PySSL_cipher(PySSLObject *self);

#define PySSLObject_Check(v)	(Py_TYPE(v) == &PySSL_Type)

typedef enum {
	SOCKET_IS_NONBLOCKING,
	SOCKET_IS_BLOCKING,
	SOCKET_HAS_TIMED_OUT,
	SOCKET_HAS_BEEN_CLOSED,
	SOCKET_TOO_LARGE_FOR_SELECT,
	SOCKET_OPERATION_OK
} timeout_state;

/* Wrap error strings with filename and line # */
#define STRINGIFY1(x) #x
#define STRINGIFY2(x) STRINGIFY1(x)
#define ERRSTR1(x,y,z) (x ":" y ": " z)
#define ERRSTR(x) ERRSTR1("_ssl.c", STRINGIFY2(__LINE__), x)

/* XXX It might be helpful to augment the error message generated
   below with the name of the SSL function that generated the error.
   I expect it's obvious most of the time.
*/

static PyObject *
PySSL_SetError(PySSLObject *obj, int ret, char *filename, int lineno)
{
	PyObject *v;
	char buf[2048];
	char *errstr;
	int err;
	enum py_ssl_error p = PY_SSL_ERROR_NONE;

	assert(ret <= 0);

	if (obj->ssl != NULL) {
		err = SSL_get_error(obj->ssl, ret);

		switch (err) {
		case SSL_ERROR_ZERO_RETURN:
			errstr = "TLS/SSL connection has been closed";
			p = PY_SSL_ERROR_ZERO_RETURN;
			break;
		case SSL_ERROR_WANT_READ:
			errstr = "The operation did not complete (read)";
			p = PY_SSL_ERROR_WANT_READ;
			break;
		case SSL_ERROR_WANT_WRITE:
			p = PY_SSL_ERROR_WANT_WRITE;
			errstr = "The operation did not complete (write)";
			break;
		case SSL_ERROR_WANT_X509_LOOKUP:
			p = PY_SSL_ERROR_WANT_X509_LOOKUP;
			errstr =
                            "The operation did not complete (X509 lookup)";
			break;
		case SSL_ERROR_WANT_CONNECT:
			p = PY_SSL_ERROR_WANT_CONNECT;
			errstr = "The operation did not complete (connect)";
			break;
		case SSL_ERROR_SYSCALL:
		{
			unsigned long e = ERR_get_error();
			if (e == 0) {
                                PySocketSockObject *s
                                  = (PySocketSockObject *) PyWeakref_GetObject(obj->Socket);
				if (ret == 0 || (((PyObject *)s) == Py_None)) {
				  p = PY_SSL_ERROR_EOF;
				  errstr =
                                      "EOF occurred in violation of protocol";
				} else if (ret == -1) {
				  /* underlying BIO reported an I/O error */
                                  return s->errorhandler();
				} else { /* possible? */
                                  p = PY_SSL_ERROR_SYSCALL;
                                  errstr = "Some I/O error occurred";
				}
			} else {
				p = PY_SSL_ERROR_SYSCALL;
				/* XXX Protected by global interpreter lock */
				errstr = ERR_error_string(e, NULL);
			}
			break;
		}
		case SSL_ERROR_SSL:
		{
			unsigned long e = ERR_get_error();
			p = PY_SSL_ERROR_SSL;
			if (e != 0)
				/* XXX Protected by global interpreter lock */
				errstr = ERR_error_string(e, NULL);
			else {	/* possible? */
				errstr =
                                    "A failure in the SSL library occurred";
			}
			break;
		}
		default:
			p = PY_SSL_ERROR_INVALID_ERROR_CODE;
			errstr = "Invalid error code";
		}
	} else {
		errstr = ERR_error_string(ERR_peek_last_error(), NULL);
	}
	PyOS_snprintf(buf, sizeof(buf), "_ssl.c:%d: %s", lineno, errstr);
	v = Py_BuildValue("(is)", p, buf);
	if (v != NULL) {
		PyErr_SetObject(PySSLErrorObject, v);
		Py_DECREF(v);
	}
	return NULL;
}

static PyObject *
_setSSLError (char *errstr, int errcode, char *filename, int lineno) {

	char buf[2048];
	PyObject *v;

	if (errstr == NULL) {
		errcode = ERR_peek_last_error();
		errstr = ERR_error_string(errcode, NULL);
	}
	PyOS_snprintf(buf, sizeof(buf), "_ssl.c:%d: %s", lineno, errstr);
	v = Py_BuildValue("(is)", errcode, buf);
	if (v != NULL) {
		PyErr_SetObject(PySSLErrorObject, v);
		Py_DECREF(v);
	}
	return NULL;
}

static PySSLObject *
newPySSLObject(PySocketSockObject *Sock, char *key_file, char *cert_file,
	       enum py_ssl_server_or_client socket_type,
	       enum py_ssl_cert_requirements certreq,
	       enum py_ssl_version proto_version,
	       char *cacerts_file)
{
	PySSLObject *self;
	char *errstr = NULL;
	int ret;
	int verification_mode;

	self = PyObject_New(PySSLObject, &PySSL_Type); /* Create new object */
	if (self == NULL)
		return NULL;
	self->peer_cert = NULL;
	self->ssl = NULL;
	self->ctx = NULL;
	self->Socket = NULL;

	/* Make sure the SSL error state is initialized */
	(void) ERR_get_state();
	ERR_clear_error();

	if ((key_file && !cert_file) || (!key_file && cert_file)) {
		errstr = ERRSTR("Both the key & certificate files "
                                "must be specified");
		goto fail;
	}

	if ((socket_type == PY_SSL_SERVER) &&
	    ((key_file == NULL) || (cert_file == NULL))) {
		errstr = ERRSTR("Both the key & certificate files "
                                "must be specified for server-side operation");
		goto fail;
	}

	PySSL_BEGIN_ALLOW_THREADS
	if (proto_version == PY_SSL_VERSION_TLS1)
		self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
	else if (proto_version == PY_SSL_VERSION_SSL3)
		self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
	else if (proto_version == PY_SSL_VERSION_SSL2)
		self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
	else if (proto_version == PY_SSL_VERSION_SSL23)
		self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */
	PySSL_END_ALLOW_THREADS

	if (self->ctx == NULL) {
		errstr = ERRSTR("Invalid SSL protocol variant specified.");
		goto fail;
	}

	if (certreq != PY_SSL_CERT_NONE) {
		if (cacerts_file == NULL) {
			errstr = ERRSTR("No root certificates specified for "
                                  "verification of other-side certificates.");
			goto fail;
		} else {
			PySSL_BEGIN_ALLOW_THREADS
			ret = SSL_CTX_load_verify_locations(self->ctx,
							    cacerts_file,
                                                            NULL);
			PySSL_END_ALLOW_THREADS
			if (ret != 1) {
				_setSSLError(NULL, 0, __FILE__, __LINE__);
				goto fail;
			}
		}
	}
	if (key_file) {
		PySSL_BEGIN_ALLOW_THREADS
		ret = SSL_CTX_use_PrivateKey_file(self->ctx, key_file,
						  SSL_FILETYPE_PEM);
		PySSL_END_ALLOW_THREADS
		if (ret != 1) {
			_setSSLError(NULL, ret, __FILE__, __LINE__);
			goto fail;
		}

		PySSL_BEGIN_ALLOW_THREADS
		ret = SSL_CTX_use_certificate_chain_file(self->ctx,
							 cert_file);
		PySSL_END_ALLOW_THREADS
		if (ret != 1) {
			/*
			fprintf(stderr, "ret is %d, errcode is %lu, %lu, with file \"%s\"\n",
				ret, ERR_peek_error(), ERR_peek_last_error(), cert_file);
				*/
			if (ERR_peek_last_error() != 0) {
				_setSSLError(NULL, ret, __FILE__, __LINE__);
				goto fail;
			}
		}
	}

        /* ssl compatibility */
        SSL_CTX_set_options(self->ctx, SSL_OP_ALL);

	verification_mode = SSL_VERIFY_NONE;
	if (certreq == PY_SSL_CERT_OPTIONAL)
		verification_mode = SSL_VERIFY_PEER;
	else if (certreq == PY_SSL_CERT_REQUIRED)
		verification_mode = (SSL_VERIFY_PEER |
				     SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
	SSL_CTX_set_verify(self->ctx, verification_mode,
			   NULL); /* set verify lvl */

	PySSL_BEGIN_ALLOW_THREADS
	self->ssl = SSL_new(self->ctx); /* New ssl struct */
	PySSL_END_ALLOW_THREADS
	SSL_set_fd(self->ssl, Sock->sock_fd);	/* Set the socket for SSL */

	/* If the socket is in non-blocking mode or timeout mode, set the BIO
	 * to non-blocking mode (blocking is the default)
	 */
	if (Sock->sock_timeout >= 0.0) {
		/* Set both the read and write BIO's to non-blocking mode */
		BIO_set_nbio(SSL_get_rbio(self->ssl), 1);
		BIO_set_nbio(SSL_get_wbio(self->ssl), 1);
	}

	PySSL_BEGIN_ALLOW_THREADS
	if (socket_type == PY_SSL_CLIENT)
		SSL_set_connect_state(self->ssl);
	else
		SSL_set_accept_state(self->ssl);
	PySSL_END_ALLOW_THREADS

	self->Socket = PyWeakref_NewRef((PyObject *) Sock, Py_None);
	return self;
 fail:
	if (errstr)
		PyErr_SetString(PySSLErrorObject, errstr);
	Py_DECREF(self);
	return NULL;
}

static PyObject *
PySSL_sslwrap(PyObject *self, PyObject *args)
{
	PySocketSockObject *Sock;
	int server_side = 0;
	int verification_mode = PY_SSL_CERT_NONE;
	int protocol = PY_SSL_VERSION_SSL23;
	char *key_file = NULL;
	char *cert_file = NULL;
	char *cacerts_file = NULL;

	if (!PyArg_ParseTuple(args, "O!i|zziiz:sslwrap",
			      PySocketModule.Sock_Type,
			      &Sock,
			      &server_side,
			      &key_file, &cert_file,
			      &verification_mode, &protocol,
			      &cacerts_file))
		return NULL;

	/*
	fprintf(stderr,
		"server_side is %d, keyfile %p, certfile %p, verify_mode %d, "
		"protocol %d, certs %p\n",
		server_side, key_file, cert_file, verification_mode,
		protocol, cacerts_file);
	 */

	return (PyObject *) newPySSLObject(Sock, key_file, cert_file,
					   server_side, verification_mode,
					   protocol, cacerts_file);
}

PyDoc_STRVAR(ssl_doc,
"sslwrap(socket, server_side, [keyfile, certfile, certs_mode, protocol,\n"
"                              cacertsfile]) -> sslobject");

/* SSL object methods */

static PyObject *PySSL_SSLdo_handshake(PySSLObject *self)
{
	int ret;
	int err;
	int sockstate;

	/* Actually negotiate SSL connection */
	/* XXX If SSL_do_handshake() returns 0, it's also a failure. */
	sockstate = 0;
	do {
                PySocketSockObject *sock
                  = (PySocketSockObject *) PyWeakref_GetObject(self->Socket);
                if (((PyObject*)sock) == Py_None) {
                        _setSSLError("Underlying socket connection gone",
                                     PY_SSL_ERROR_NO_SOCKET, __FILE__, __LINE__);
                        return NULL;
                }

		PySSL_BEGIN_ALLOW_THREADS
		ret = SSL_do_handshake(self->ssl);
		err = SSL_get_error(self->ssl, ret);
		PySSL_END_ALLOW_THREADS
		if(PyErr_CheckSignals()) {
			return NULL;
		}
		if (err == SSL_ERROR_WANT_READ) {
			sockstate = check_socket_and_wait_for_timeout(sock, 0);
		} else if (err == SSL_ERROR_WANT_WRITE) {
			sockstate = check_socket_and_wait_for_timeout(sock, 1);
		} else {
			sockstate = SOCKET_OPERATION_OK;
		}
		if (sockstate == SOCKET_HAS_TIMED_OUT) {
			PyErr_SetString(PySSLErrorObject,
				ERRSTR("The handshake operation timed out"));
			return NULL;
		} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
			PyErr_SetString(PySSLErrorObject,
				ERRSTR("Underlying socket has been closed."));
			return NULL;
		} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
			PyErr_SetString(PySSLErrorObject,
			  ERRSTR("Underlying socket too large for select()."));
			return NULL;
		} else if (sockstate == SOCKET_IS_NONBLOCKING) {
			break;
		}
	} while (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE);
	if (ret < 1)
		return PySSL_SetError(self, ret, __FILE__, __LINE__);
	self->ssl->debug = 1;

	if (self->peer_cert)
		X509_free (self->peer_cert);
        PySSL_BEGIN_ALLOW_THREADS
	self->peer_cert = SSL_get_peer_certificate(self->ssl);
	PySSL_END_ALLOW_THREADS

	Py_INCREF(Py_None);
	return Py_None;
}

static PyObject *
_create_tuple_for_attribute (ASN1_OBJECT *name, ASN1_STRING *value) {

	char namebuf[X509_NAME_MAXLEN];
	int buflen;
	PyObject *name_obj;
	PyObject *value_obj;
	PyObject *attr;
	unsigned char *valuebuf = NULL;

	buflen = OBJ_obj2txt(namebuf, sizeof(namebuf), name, 0);
	if (buflen < 0) {
		_setSSLError(NULL, 0, __FILE__, __LINE__);
		goto fail;
	}
	name_obj = PyUnicode_FromStringAndSize(namebuf, buflen);
	if (name_obj == NULL)
		goto fail;

	buflen = ASN1_STRING_to_UTF8(&valuebuf, value);
	if (buflen < 0) {
		_setSSLError(NULL, 0, __FILE__, __LINE__);
		Py_DECREF(name_obj);
		goto fail;
	}
	value_obj = PyUnicode_DecodeUTF8((char *) valuebuf,
						 buflen, "strict");
	OPENSSL_free(valuebuf);
	if (value_obj == NULL) {
		Py_DECREF(name_obj);
		goto fail;
	}
	attr = PyTuple_New(2);
	if (attr == NULL) {
		Py_DECREF(name_obj);
		Py_DECREF(value_obj);
		goto fail;
	}
	PyTuple_SET_ITEM(attr, 0, name_obj);
	PyTuple_SET_ITEM(attr, 1, value_obj);
	return attr;

  fail:
	return NULL;
}

static PyObject *
_create_tuple_for_X509_NAME (X509_NAME *xname)
{
	PyObject *dn = NULL;    /* tuple which represents the "distinguished name" */
        PyObject *rdn = NULL;   /* tuple to hold a "relative distinguished name" */
	PyObject *rdnt;
        PyObject *attr = NULL;   /* tuple to hold an attribute */
        int entry_count = X509_NAME_entry_count(xname);
	X509_NAME_ENTRY *entry;
	ASN1_OBJECT *name;
	ASN1_STRING *value;
	int index_counter;
	int rdn_level = -1;
	int retcode;

        dn = PyList_New(0);
	if (dn == NULL)
		return NULL;
        /* now create another tuple to hold the top-level RDN */
        rdn = PyList_New(0);
	if (rdn == NULL)
		goto fail0;

	for (index_counter = 0;
	     index_counter < entry_count;
	     index_counter++)
	{
		entry = X509_NAME_get_entry(xname, index_counter);

		/* check to see if we've gotten to a new RDN */
		if (rdn_level >= 0) {
			if (rdn_level != entry->set) {
				/* yes, new RDN */
				/* add old RDN to DN */
				rdnt = PyList_AsTuple(rdn);
				Py_DECREF(rdn);
				if (rdnt == NULL)
					goto fail0;
				retcode = PyList_Append(dn, rdnt);
				Py_DECREF(rdnt);
				if (retcode < 0)
					goto fail0;
				/* create new RDN */
				rdn = PyList_New(0);
				if (rdn == NULL)
					goto fail0;
			}
		}
		rdn_level = entry->set;

		/* now add this attribute to the current RDN */
		name = X509_NAME_ENTRY_get_object(entry);
		value = X509_NAME_ENTRY_get_data(entry);
		attr = _create_tuple_for_attribute(name, value);
                /*
                fprintf(stderr, "RDN level %d, attribute %s: %s\n",
                        entry->set,
                        PyBytes_AS_STRING(PyTuple_GET_ITEM(attr, 0)),
                        PyBytes_AS_STRING(PyTuple_GET_ITEM(attr, 1)));
                */
		if (attr == NULL)
			goto fail1;
                retcode = PyList_Append(rdn, attr);
		Py_DECREF(attr);
		if (retcode < 0)
			goto fail1;
	}
	/* now, there's typically a dangling RDN */
	if ((rdn != NULL) && (PyList_Size(rdn) > 0)) {
		rdnt = PyList_AsTuple(rdn);
		Py_DECREF(rdn);
		if (rdnt == NULL)
			goto fail0;
		retcode = PyList_Append(dn, rdnt);
		Py_DECREF(rdnt);
		if (retcode < 0)
			goto fail0;
	}

	/* convert list to tuple */
	rdnt = PyList_AsTuple(dn);
	Py_DECREF(dn);
	if (rdnt == NULL)
		return NULL;
	return rdnt;

  fail1:
	Py_XDECREF(rdn);

  fail0:
	Py_XDECREF(dn);
	return NULL;
}

static PyObject *
_get_peer_alt_names (X509 *certificate) {

	/* this code follows the procedure outlined in
	   OpenSSL's crypto/x509v3/v3_prn.c:X509v3_EXT_print()
	   function to extract the STACK_OF(GENERAL_NAME),
	   then iterates through the stack to add the
	   names. */

	int i, j;
	PyObject *peer_alt_names = Py_None;
	PyObject *v, *t;
	X509_EXTENSION *ext = NULL;
	GENERAL_NAMES *names = NULL;
	GENERAL_NAME *name;
	X509V3_EXT_METHOD *method;
	BIO *biobuf = NULL;
	char buf[2048];
	char *vptr;
	int len;
	unsigned char *p;

	if (certificate == NULL)
		return peer_alt_names;

	/* get a memory buffer */
	biobuf = BIO_new(BIO_s_mem());

	i = 0;
	while ((i = X509_get_ext_by_NID(
			certificate, NID_subject_alt_name, i)) >= 0) {

		if (peer_alt_names == Py_None) {
                        peer_alt_names = PyList_New(0);
                        if (peer_alt_names == NULL)
				goto fail;
		}

		/* now decode the altName */
		ext = X509_get_ext(certificate, i);
		if(!(method = X509V3_EXT_get(ext))) {
			PyErr_SetString
                          (PySSLErrorObject,
                           ERRSTR("No method for internalizing subjectAltName!"));
			goto fail;
		}

		p = ext->value->data;
		if (method->it)
			names = (GENERAL_NAMES*)
                          (ASN1_item_d2i(NULL,
                                         &p,
                                         ext->value->length,
                                         ASN1_ITEM_ptr(method->it)));
		else
			names = (GENERAL_NAMES*)
                          (method->d2i(NULL,
                                       &p,
                                       ext->value->length));

		for(j = 0; j < sk_GENERAL_NAME_num(names); j++) {

			/* get a rendering of each name in the set of names */

			name = sk_GENERAL_NAME_value(names, j);
			if (name->type == GEN_DIRNAME) {

				/* we special-case DirName as a tuple of
                                   tuples of attributes */

				t = PyTuple_New(2);
				if (t == NULL) {
					goto fail;
				}

				v = PyUnicode_FromString("DirName");
				if (v == NULL) {
					Py_DECREF(t);
					goto fail;
				}
				PyTuple_SET_ITEM(t, 0, v);

				v = _create_tuple_for_X509_NAME (name->d.dirn);
				if (v == NULL) {
					Py_DECREF(t);
					goto fail;
				}
				PyTuple_SET_ITEM(t, 1, v);

			} else {

				/* for everything else, we use the OpenSSL print form */

				(void) BIO_reset(biobuf);
				GENERAL_NAME_print(biobuf, name);
				len = BIO_gets(biobuf, buf, sizeof(buf)-1);
				if (len < 0) {
					_setSSLError(NULL, 0, __FILE__, __LINE__);
					goto fail;
				}
				vptr = strchr(buf, ':');
				if (vptr == NULL)
					goto fail;
				t = PyTuple_New(2);
				if (t == NULL)
					goto fail;
				v = PyUnicode_FromStringAndSize(buf, (vptr - buf));
				if (v == NULL) {
					Py_DECREF(t);
					goto fail;
				}
				PyTuple_SET_ITEM(t, 0, v);
				v = PyUnicode_FromStringAndSize((vptr + 1),
                                                                (len - (vptr - buf + 1)));
				if (v == NULL) {
					Py_DECREF(t);
					goto fail;
				}
				PyTuple_SET_ITEM(t, 1, v);
			}

			/* and add that rendering to the list */

			if (PyList_Append(peer_alt_names, t) < 0) {
				Py_DECREF(t);
				goto fail;
			}
			Py_DECREF(t);
		}
	}
	BIO_free(biobuf);
	if (peer_alt_names != Py_None) {
		v = PyList_AsTuple(peer_alt_names);
		Py_DECREF(peer_alt_names);
		return v;
	} else {
		return peer_alt_names;
	}


  fail:
	if (biobuf != NULL)
		BIO_free(biobuf);

	if (peer_alt_names != Py_None) {
		Py_XDECREF(peer_alt_names);
	}

	return NULL;
}

static PyObject *
_decode_certificate (X509 *certificate, int verbose) {

	PyObject *retval = NULL;
	BIO *biobuf = NULL;
	PyObject *peer;
	PyObject *peer_alt_names = NULL;
	PyObject *issuer;
	PyObject *version;
	PyObject *sn_obj;
	ASN1_INTEGER *serialNumber;
	char buf[2048];
	int len;
	ASN1_TIME *notBefore, *notAfter;
	PyObject *pnotBefore, *pnotAfter;

	retval = PyDict_New();
	if (retval == NULL)
		return NULL;

	peer = _create_tuple_for_X509_NAME(
		X509_get_subject_name(certificate));
	if (peer == NULL)
		goto fail0;
	if (PyDict_SetItemString(retval, (const char *) "subject", peer) < 0) {
		Py_DECREF(peer);
		goto fail0;
	}
	Py_DECREF(peer);

	if (verbose) {
		issuer = _create_tuple_for_X509_NAME(
			X509_get_issuer_name(certificate));
		if (issuer == NULL)
			goto fail0;
		if (PyDict_SetItemString(retval, (const char *)"issuer", issuer) < 0) {
			Py_DECREF(issuer);
			goto fail0;
		}
		Py_DECREF(issuer);

		version = PyLong_FromLong(X509_get_version(certificate) + 1);
		if (PyDict_SetItemString(retval, "version", version) < 0) {
			Py_DECREF(version);
			goto fail0;
		}
		Py_DECREF(version);
	}

	/* get a memory buffer */
	biobuf = BIO_new(BIO_s_mem());

	if (verbose) {

		(void) BIO_reset(biobuf);
		serialNumber = X509_get_serialNumber(certificate);
		/* should not exceed 20 octets, 160 bits, so buf is big enough */
		i2a_ASN1_INTEGER(biobuf, serialNumber);
		len = BIO_gets(biobuf, buf, sizeof(buf)-1);
		if (len < 0) {
			_setSSLError(NULL, 0, __FILE__, __LINE__);
			goto fail1;
		}
		sn_obj = PyUnicode_FromStringAndSize(buf, len);
		if (sn_obj == NULL)
			goto fail1;
		if (PyDict_SetItemString(retval, "serialNumber", sn_obj) < 0) {
			Py_DECREF(sn_obj);
			goto fail1;
		}
		Py_DECREF(sn_obj);

		(void) BIO_reset(biobuf);
		notBefore = X509_get_notBefore(certificate);
		ASN1_TIME_print(biobuf, notBefore);
		len = BIO_gets(biobuf, buf, sizeof(buf)-1);
		if (len < 0) {
			_setSSLError(NULL, 0, __FILE__, __LINE__);
			goto fail1;
		}
		pnotBefore = PyUnicode_FromStringAndSize(buf, len);
		if (pnotBefore == NULL)
			goto fail1;
		if (PyDict_SetItemString(retval, "notBefore", pnotBefore) < 0) {
			Py_DECREF(pnotBefore);
			goto fail1;
		}
		Py_DECREF(pnotBefore);
	}

	(void) BIO_reset(biobuf);
	notAfter = X509_get_notAfter(certificate);
	ASN1_TIME_print(biobuf, notAfter);
	len = BIO_gets(biobuf, buf, sizeof(buf)-1);
	if (len < 0) {
		_setSSLError(NULL, 0, __FILE__, __LINE__);
		goto fail1;
	}
	pnotAfter = PyUnicode_FromStringAndSize(buf, len);
	if (pnotAfter == NULL)
		goto fail1;
	if (PyDict_SetItemString(retval, "notAfter", pnotAfter) < 0) {
		Py_DECREF(pnotAfter);
		goto fail1;
	}
	Py_DECREF(pnotAfter);

	/* Now look for subjectAltName */

	peer_alt_names = _get_peer_alt_names(certificate);
	if (peer_alt_names == NULL)
		goto fail1;
	else if (peer_alt_names != Py_None) {
		if (PyDict_SetItemString(retval, "subjectAltName",
					 peer_alt_names) < 0) {
			Py_DECREF(peer_alt_names);
			goto fail1;
		}
		Py_DECREF(peer_alt_names);
	}

	BIO_free(biobuf);
	return retval;

  fail1:
	if (biobuf != NULL)
		BIO_free(biobuf);
  fail0:
	Py_XDECREF(retval);
	return NULL;
}


static PyObject *
PySSL_test_decode_certificate (PyObject *mod, PyObject *args) {

	PyObject *retval = NULL;
	char *filename = NULL;
	X509 *x=NULL;
	BIO *cert;
	int verbose = 1;

	if (!PyArg_ParseTuple(args, "s|i:test_decode_certificate",
                              &filename, &verbose))
		return NULL;

	if ((cert=BIO_new(BIO_s_file())) == NULL) {
		PyErr_SetString(PySSLErrorObject,
                                "Can't malloc memory to read file");
		goto fail0;
	}

	if (BIO_read_filename(cert,filename) <= 0) {
		PyErr_SetString(PySSLErrorObject,
                                "Can't open file");
		goto fail0;
	}

	x = PEM_read_bio_X509_AUX(cert,NULL, NULL, NULL);
	if (x == NULL) {
		PyErr_SetString(PySSLErrorObject,
                                "Error decoding PEM-encoded file");
		goto fail0;
	}

	retval = _decode_certificate(x, verbose);

  fail0:

	if (cert != NULL) BIO_free(cert);
	return retval;
}


static PyObject *
PySSL_peercert(PySSLObject *self, PyObject *args)
{
	PyObject *retval = NULL;
	int len;
	int verification;
	PyObject *binary_mode = Py_None;

	if (!PyArg_ParseTuple(args, "|O:peer_certificate", &binary_mode))
		return NULL;

	if (!self->peer_cert)
		Py_RETURN_NONE;

	if (PyObject_IsTrue(binary_mode)) {
		/* return cert in DER-encoded format */

		unsigned char *bytes_buf = NULL;

		bytes_buf = NULL;
		len = i2d_X509(self->peer_cert, &bytes_buf);
		if (len < 0) {
			PySSL_SetError(self, len, __FILE__, __LINE__);
			return NULL;
		}
                /* this is actually an immutable bytes sequence */
		retval = PyBytes_FromStringAndSize
                  ((const char *) bytes_buf, len);
		OPENSSL_free(bytes_buf);
		return retval;

	} else {

		verification = SSL_CTX_get_verify_mode(self->ctx);
		if ((verification & SSL_VERIFY_PEER) == 0)
			return PyDict_New();
		else
			return _decode_certificate (self->peer_cert, 0);
	}
}

PyDoc_STRVAR(PySSL_peercert_doc,
"peer_certificate([der=False]) -> certificate\n\
\n\
Returns the certificate for the peer.  If no certificate was provided,\n\
returns None.  If a certificate was provided, but not validated, returns\n\
an empty dictionary.  Otherwise returns a dict containing information\n\
about the peer certificate.\n\
\n\
If the optional argument is True, returns a DER-encoded copy of the\n\
peer certificate, or None if no certificate was provided.  This will\n\
return the certificate even if it wasn't validated.");

static PyObject *PySSL_cipher (PySSLObject *self) {

	PyObject *retval, *v;
	SSL_CIPHER *current;
	char *cipher_name;
	char *cipher_protocol;

	if (self->ssl == NULL)
		return Py_None;
	current = SSL_get_current_cipher(self->ssl);
	if (current == NULL)
		return Py_None;

	retval = PyTuple_New(3);
	if (retval == NULL)
		return NULL;

	cipher_name = (char *) SSL_CIPHER_get_name(current);
	if (cipher_name == NULL) {
		PyTuple_SET_ITEM(retval, 0, Py_None);
	} else {
		v = PyUnicode_FromString(cipher_name);
		if (v == NULL)
			goto fail0;
		PyTuple_SET_ITEM(retval, 0, v);
	}
	cipher_protocol = SSL_CIPHER_get_version(current);
	if (cipher_protocol == NULL) {
		PyTuple_SET_ITEM(retval, 1, Py_None);
	} else {
		v = PyUnicode_FromString(cipher_protocol);
		if (v == NULL)
			goto fail0;
		PyTuple_SET_ITEM(retval, 1, v);
	}
	v = PyLong_FromLong(SSL_CIPHER_get_bits(current, NULL));
	if (v == NULL)
		goto fail0;
	PyTuple_SET_ITEM(retval, 2, v);
	return retval;

  fail0:
	Py_DECREF(retval);
	return NULL;
}

static void PySSL_dealloc(PySSLObject *self)
{
	if (self->peer_cert)	/* Possible not to have one? */
		X509_free (self->peer_cert);
	if (self->ssl)
		SSL_free(self->ssl);
	if (self->ctx)
		SSL_CTX_free(self->ctx);
	Py_XDECREF(self->Socket);
	PyObject_Del(self);
}

/* If the socket has a timeout, do a select()/poll() on the socket.
   The argument writing indicates the direction.
   Returns one of the possibilities in the timeout_state enum (above).
 */

static int
check_socket_and_wait_for_timeout(PySocketSockObject *s, int writing)
{
	fd_set fds;
	struct timeval tv;
	int rc;

	/* Nothing to do unless we're in timeout mode (not non-blocking) */
	if (s->sock_timeout < 0.0)
		return SOCKET_IS_BLOCKING;
	else if (s->sock_timeout == 0.0)
		return SOCKET_IS_NONBLOCKING;

	/* Guard against closed socket */
	if (s->sock_fd < 0)
		return SOCKET_HAS_BEEN_CLOSED;

	/* Prefer poll, if available, since you can poll() any fd
	 * which can't be done with select(). */
#ifdef HAVE_POLL
	{
		struct pollfd pollfd;
		int timeout;

		pollfd.fd = s->sock_fd;
		pollfd.events = writing ? POLLOUT : POLLIN;

		/* s->sock_timeout is in seconds, timeout in ms */
		timeout = (int)(s->sock_timeout * 1000 + 0.5);
		PySSL_BEGIN_ALLOW_THREADS
		rc = poll(&pollfd, 1, timeout);
		PySSL_END_ALLOW_THREADS

		goto normal_return;
	}
#endif

	/* Guard against socket too large for select*/
#ifndef Py_SOCKET_FD_CAN_BE_GE_FD_SETSIZE
	if (s->sock_fd >= FD_SETSIZE)
		return SOCKET_TOO_LARGE_FOR_SELECT;
#endif

	/* Construct the arguments to select */
	tv.tv_sec = (int)s->sock_timeout;
	tv.tv_usec = (int)((s->sock_timeout - tv.tv_sec) * 1e6);
	FD_ZERO(&fds);
	FD_SET(s->sock_fd, &fds);

	/* See if the socket is ready */
	PySSL_BEGIN_ALLOW_THREADS
	if (writing)
		rc = select(s->sock_fd+1, NULL, &fds, NULL, &tv);
	else
		rc = select(s->sock_fd+1, &fds, NULL, NULL, &tv);
	PySSL_END_ALLOW_THREADS

#ifdef HAVE_POLL
normal_return:
#endif
	/* Return SOCKET_TIMED_OUT on timeout, SOCKET_OPERATION_OK otherwise
	   (when we are able to write or when there's something to read) */
	return rc == 0 ? SOCKET_HAS_TIMED_OUT : SOCKET_OPERATION_OK;
}

static PyObject *PySSL_SSLwrite(PySSLObject *self, PyObject *args)
{
	char *data;
	int len;
	int count;
	int sockstate;
	int err;
        int nonblocking;
        PySocketSockObject *sock
          = (PySocketSockObject *) PyWeakref_GetObject(self->Socket);

        if (((PyObject*)sock) == Py_None) {
                _setSSLError("Underlying socket connection gone",
                             PY_SSL_ERROR_NO_SOCKET, __FILE__, __LINE__);
                return NULL;
        }

	if (!PyArg_ParseTuple(args, "y#:write", &data, &count))
		return NULL;

        /* just in case the blocking state of the socket has been changed */
	nonblocking = (sock->sock_timeout >= 0.0);
        BIO_set_nbio(SSL_get_rbio(self->ssl), nonblocking);
        BIO_set_nbio(SSL_get_wbio(self->ssl), nonblocking);

	sockstate = check_socket_and_wait_for_timeout(sock, 1);
	if (sockstate == SOCKET_HAS_TIMED_OUT) {
		PyErr_SetString(PySSLErrorObject,
                                "The write operation timed out");
		return NULL;
	} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
		PyErr_SetString(PySSLErrorObject,
                                "Underlying socket has been closed.");
		return NULL;
	} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
		PyErr_SetString(PySSLErrorObject,
                                "Underlying socket too large for select().");
		return NULL;
	}
	do {
		err = 0;
		PySSL_BEGIN_ALLOW_THREADS
		len = SSL_write(self->ssl, data, count);
		err = SSL_get_error(self->ssl, len);
		PySSL_END_ALLOW_THREADS
		if(PyErr_CheckSignals()) {
			return NULL;
		}
		if (err == SSL_ERROR_WANT_READ) {
			sockstate =
                            check_socket_and_wait_for_timeout(sock, 0);
		} else if (err == SSL_ERROR_WANT_WRITE) {
			sockstate =
                            check_socket_and_wait_for_timeout(sock, 1);
		} else {
			sockstate = SOCKET_OPERATION_OK;
		}
		if (sockstate == SOCKET_HAS_TIMED_OUT) {
			PyErr_SetString(PySSLErrorObject,
                                        "The write operation timed out");
			return NULL;
		} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
			PyErr_SetString(PySSLErrorObject,
                                        "Underlying socket has been closed.");
			return NULL;
		} else if (sockstate == SOCKET_IS_NONBLOCKING) {
			break;
		}
	} while (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE);
	if (len > 0)
		return PyLong_FromLong(len);
	else
		return PySSL_SetError(self, len, __FILE__, __LINE__);
}

PyDoc_STRVAR(PySSL_SSLwrite_doc,
"write(s) -> len\n\
\n\
Writes the string s into the SSL object.  Returns the number\n\
of bytes written.");

static PyObject *PySSL_SSLpending(PySSLObject *self)
{
	int count = 0;

	PySSL_BEGIN_ALLOW_THREADS
	count = SSL_pending(self->ssl);
	PySSL_END_ALLOW_THREADS
	if (count < 0)
		return PySSL_SetError(self, count, __FILE__, __LINE__);
	else
		return PyLong_FromLong(count);
}

PyDoc_STRVAR(PySSL_SSLpending_doc,
"pending() -> count\n\
\n\
Returns the number of already decrypted bytes available for read,\n\
pending on the connection.\n");

static PyObject *PySSL_SSLread(PySSLObject *self, PyObject *args)
{
	PyObject *dest = NULL;
	Py_buffer buf;
	int buf_passed = 0;
	int count = -1;
	char *mem;
	/* XXX this should use Py_ssize_t */
	int len = 1024;
	int sockstate;
	int err;
        int nonblocking;
        PySocketSockObject *sock
          = (PySocketSockObject *) PyWeakref_GetObject(self->Socket);

        if (((PyObject*)sock) == Py_None) {
                _setSSLError("Underlying socket connection gone",
                             PY_SSL_ERROR_NO_SOCKET, __FILE__, __LINE__);
                return NULL;
        }

	if (!PyArg_ParseTuple(args, "|Oi:read", &dest, &count))
		return NULL;
        if ((dest == NULL) || (dest == Py_None)) {
		if (!(dest = PyByteArray_FromStringAndSize((char *) 0, len)))
			return NULL;
		mem = PyByteArray_AS_STRING(dest);
        } else if (PyLong_Check(dest)) {
		len = PyLong_AS_LONG(dest);
		if (!(dest = PyByteArray_FromStringAndSize((char *) 0, len)))
			return NULL;
		mem = PyByteArray_AS_STRING(dest);
	} else {
		if (PyObject_GetBuffer(dest, &buf, PyBUF_CONTIG) < 0)
			return NULL;
		mem = buf.buf;
		len = buf.len;
		if ((count > 0) && (count <= len))
			len = count;
		buf_passed = 1;
	}

        /* just in case the blocking state of the socket has been changed */
	nonblocking = (sock->sock_timeout >= 0.0);
        BIO_set_nbio(SSL_get_rbio(self->ssl), nonblocking);
        BIO_set_nbio(SSL_get_wbio(self->ssl), nonblocking);

	/* first check if there are bytes ready to be read */
	PySSL_BEGIN_ALLOW_THREADS
	count = SSL_pending(self->ssl);
	PySSL_END_ALLOW_THREADS

	if (!count) {
		sockstate = check_socket_and_wait_for_timeout(sock, 0);
		if (sockstate == SOCKET_HAS_TIMED_OUT) {
			PyErr_SetString(PySSLErrorObject,
					"The read operation timed out");
			goto error;
		} else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
			PyErr_SetString(PySSLErrorObject,
				"Underlying socket too large for select().");
			goto error;
		} else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
			count = 0;
			goto done;
		}
	}
	do {
		err = 0;
		PySSL_BEGIN_ALLOW_THREADS
		count = SSL_read(self->ssl, mem, len);
		err = SSL_get_error(self->ssl, count);
		PySSL_END_ALLOW_THREADS
		if (PyErr_CheckSignals())
			goto error;
		if (err == SSL_ERROR_WANT_READ) {
			sockstate =
			  check_socket_and_wait_for_timeout(sock, 0);
		} else if (err == SSL_ERROR_WANT_WRITE) {
			sockstate =
			  check_socket_and_wait_for_timeout(sock, 1);
		} else if ((err == SSL_ERROR_ZERO_RETURN) &&
			   (SSL_get_shutdown(self->ssl) ==
			    SSL_RECEIVED_SHUTDOWN))
		{
			count = 0;
			goto done;
		} else {
			sockstate = SOCKET_OPERATION_OK;
		}
		if (sockstate == SOCKET_HAS_TIMED_OUT) {
			PyErr_SetString(PySSLErrorObject,
					"The read operation timed out");
			goto error;
		} else if (sockstate == SOCKET_IS_NONBLOCKING) {
			break;
		}
	} while (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE);
	if (count <= 0) {
		PySSL_SetError(self, count, __FILE__, __LINE__);
		goto error;
	}
  done:
	if (!buf_passed) {
		PyObject *res = PyBytes_FromStringAndSize(mem, count);
		Py_DECREF(dest);
		return res;
	} else {
		PyBuffer_Release(&buf);
		return PyLong_FromLong(count);
	}
  error:
	if (!buf_passed) {
		Py_DECREF(dest);
	} else {
		PyBuffer_Release(&buf);
	}
	return NULL;
}

PyDoc_STRVAR(PySSL_SSLread_doc,
"read([len]) -> string\n\
\n\
Read up to len bytes from the SSL socket.");

static PyObject *PySSL_SSLshutdown(PySSLObject *self)
{
	int err;
        PySocketSockObject *sock
          = (PySocketSockObject *) PyWeakref_GetObject(self->Socket);

	/* Guard against closed socket */
        if ((((PyObject*)sock) == Py_None) || (sock->sock_fd < 0)) {
                _setSSLError("Underlying socket connection gone",
                             PY_SSL_ERROR_NO_SOCKET, __FILE__, __LINE__);
                return NULL;
        }

	PySSL_BEGIN_ALLOW_THREADS
	err = SSL_shutdown(self->ssl);
	if (err == 0) {
		/* we need to call it again to finish the shutdown */
		err = SSL_shutdown(self->ssl);
	}
	PySSL_END_ALLOW_THREADS

	if (err < 0)
		return PySSL_SetError(self, err, __FILE__, __LINE__);
	else {
                Py_INCREF(sock);
                return (PyObject *) sock;
	}
}

PyDoc_STRVAR(PySSL_SSLshutdown_doc,
"shutdown(s) -> socket\n\
\n\
Does the SSL shutdown handshake with the remote end, and returns\n\
the underlying socket object.");


static PyMethodDef PySSLMethods[] = {
	{"do_handshake", (PyCFunction)PySSL_SSLdo_handshake, METH_NOARGS},
	{"write", (PyCFunction)PySSL_SSLwrite, METH_VARARGS,
	 PySSL_SSLwrite_doc},
	{"read", (PyCFunction)PySSL_SSLread, METH_VARARGS,
	 PySSL_SSLread_doc},
	{"pending", (PyCFunction)PySSL_SSLpending, METH_NOARGS,
	 PySSL_SSLpending_doc},
	{"peer_certificate", (PyCFunction)PySSL_peercert, METH_VARARGS,
	 PySSL_peercert_doc},
	{"cipher", (PyCFunction)PySSL_cipher, METH_NOARGS},
	{"shutdown", (PyCFunction)PySSL_SSLshutdown, METH_NOARGS,
	 PySSL_SSLshutdown_doc},
	{NULL, NULL}
};

static PyTypeObject PySSL_Type = {
	PyVarObject_HEAD_INIT(NULL, 0)
	"ssl.SSLContext",		/*tp_name*/
	sizeof(PySSLObject),		/*tp_basicsize*/
	0,				/*tp_itemsize*/
	/* methods */
	(destructor)PySSL_dealloc,	/*tp_dealloc*/
	0,				/*tp_print*/
	0,				/*tp_getattr*/
	0,				/*tp_setattr*/
	0,				/*tp_reserved*/
	0,				/*tp_repr*/
	0,				/*tp_as_number*/
	0,				/*tp_as_sequence*/
	0,				/*tp_as_mapping*/
	0,				/*tp_hash*/
	0,				/*tp_call*/
	0,				/*tp_str*/
	0,				/*tp_getattro*/
	0,				/*tp_setattro*/
	0,				/*tp_as_buffer*/
	Py_TPFLAGS_DEFAULT,		/*tp_flags*/
	0,				/*tp_doc*/
	0,				/*tp_traverse*/
	0,				/*tp_clear*/
	0,				/*tp_richcompare*/
	0,				/*tp_weaklistoffset*/
	0,				/*tp_iter*/
	0,				/*tp_iternext*/
	PySSLMethods,			/*tp_methods*/
};

#ifdef HAVE_OPENSSL_RAND

/* helper routines for seeding the SSL PRNG */
static PyObject *
PySSL_RAND_add(PyObject *self, PyObject *args)
{
    char *buf;
    int len;
    double entropy;

    if (!PyArg_ParseTuple(args, "s#d:RAND_add", &buf, &len, &entropy))
	return NULL;
    RAND_add(buf, len, entropy);
    Py_INCREF(Py_None);
    return Py_None;
}

PyDoc_STRVAR(PySSL_RAND_add_doc,
"RAND_add(string, entropy)\n\
\n\
Mix string into the OpenSSL PRNG state.  entropy (a float) is a lower\n\
bound on the entropy contained in string.  See RFC 1750.");

static PyObject *
PySSL_RAND_status(PyObject *self)
{
    return PyLong_FromLong(RAND_status());
}

PyDoc_STRVAR(PySSL_RAND_status_doc,
"RAND_status() -> 0 or 1\n\
\n\
Returns 1 if the OpenSSL PRNG has been seeded with enough data and 0 if not.\n\
It is necessary to seed the PRNG with RAND_add() on some platforms before\n\
using the ssl() function.");

static PyObject *
PySSL_RAND_egd(PyObject *self, PyObject *arg)
{
    int bytes;

    if (!PyUnicode_Check(arg))
	return PyErr_Format(PyExc_TypeError,
			    "RAND_egd() expected string, found %s",
			    Py_TYPE(arg)->tp_name);
    bytes = RAND_egd(_PyUnicode_AsString(arg));
    if (bytes == -1) {
	PyErr_SetString(PySSLErrorObject,
			"EGD connection failed or EGD did not return "
			"enough data to seed the PRNG");
	return NULL;
    }
    return PyLong_FromLong(bytes);
}

PyDoc_STRVAR(PySSL_RAND_egd_doc,
"RAND_egd(path) -> bytes\n\
\n\
Queries the entropy gather daemon (EGD) on the socket named by 'path'.\n\
Returns number of bytes read.  Raises SSLError if connection to EGD\n\
fails or if it does provide enough data to seed PRNG.");

#endif



/* List of functions exported by this module. */

static PyMethodDef PySSL_methods[] = {
	{"sslwrap",             PySSL_sslwrap,
         METH_VARARGS, ssl_doc},
	{"_test_decode_cert",	PySSL_test_decode_certificate,
	 METH_VARARGS},
#ifdef HAVE_OPENSSL_RAND
	{"RAND_add",            PySSL_RAND_add, METH_VARARGS,
	 PySSL_RAND_add_doc},
	{"RAND_egd",            PySSL_RAND_egd, METH_O,
	 PySSL_RAND_egd_doc},
	{"RAND_status",         (PyCFunction)PySSL_RAND_status, METH_NOARGS,
	 PySSL_RAND_status_doc},
#endif
	{NULL,                  NULL}            /* Sentinel */
};


#ifdef WITH_THREAD

/* an implementation of OpenSSL threading operations in terms
   of the Python C thread library */

static PyThread_type_lock *_ssl_locks = NULL;

static unsigned long _ssl_thread_id_function (void) {
	return PyThread_get_thread_ident();
}

static void _ssl_thread_locking_function
        (int mode, int n, const char *file, int line) {
	/* this function is needed to perform locking on shared data
	   structures. (Note that OpenSSL uses a number of global data
	   structures that will be implicitly shared whenever multiple
	   threads use OpenSSL.) Multi-threaded applications will
	   crash at random if it is not set.

	   locking_function() must be able to handle up to
	   CRYPTO_num_locks() different mutex locks. It sets the n-th
	   lock if mode & CRYPTO_LOCK, and releases it otherwise.

	   file and line are the file number of the function setting the
	   lock. They can be useful for debugging.
	*/

	if ((_ssl_locks == NULL) ||
	    (n < 0) || ((unsigned)n >= _ssl_locks_count))
		return;

	if (mode & CRYPTO_LOCK) {
		PyThread_acquire_lock(_ssl_locks[n], 1);
	} else {
		PyThread_release_lock(_ssl_locks[n]);
	}
}

static int _setup_ssl_threads(void) {

	unsigned int i;

	if (_ssl_locks == NULL) {
		_ssl_locks_count = CRYPTO_num_locks();
		_ssl_locks = (PyThread_type_lock *)
			malloc(sizeof(PyThread_type_lock) * _ssl_locks_count);
		if (_ssl_locks == NULL)
			return 0;
		memset(_ssl_locks, 0,
                       sizeof(PyThread_type_lock) * _ssl_locks_count);
		for (i = 0;  i < _ssl_locks_count;  i++) {
			_ssl_locks[i] = PyThread_allocate_lock();
			if (_ssl_locks[i] == NULL) {
				unsigned int j;
				for (j = 0;  j < i;  j++) {
					PyThread_free_lock(_ssl_locks[j]);
				}
				free(_ssl_locks);
				return 0;
			}
		}
		CRYPTO_set_locking_callback(_ssl_thread_locking_function);
		CRYPTO_set_id_callback(_ssl_thread_id_function);
	}
	return 1;
}

#endif	/* def HAVE_THREAD */

PyDoc_STRVAR(module_doc,
"Implementation module for SSL socket operations.  See the socket module\n\
for documentation.");


static struct PyModuleDef _sslmodule = {
	PyModuleDef_HEAD_INIT,
	"_ssl",
	module_doc,
	-1,
	PySSL_methods,
	NULL,
	NULL,
	NULL,
	NULL
};

PyMODINIT_FUNC
PyInit__ssl(void)
{
	PyObject *m, *d;
        PySocketModule_APIObject *socket_api;

	if (PyType_Ready(&PySSL_Type) < 0)
		return NULL;

	m = PyModule_Create(&_sslmodule);
	if (m == NULL)
		return NULL;
	d = PyModule_GetDict(m);

	/* Load _socket module and its C API */
        socket_api = PySocketModule_ImportModuleAndAPI();
	if (!socket_api)
		return NULL;
        PySocketModule = *socket_api;

	/* Init OpenSSL */
	SSL_load_error_strings();
#ifdef WITH_THREAD
	/* note that this will start threading if not already started */
	if (!_setup_ssl_threads()) {
		return NULL;
	}
#endif
	SSLeay_add_ssl_algorithms();

	/* Add symbols to module dict */
	PySSLErrorObject = PyErr_NewException("ssl.SSLError",
					      PySocketModule.error,
					      NULL);
	if (PySSLErrorObject == NULL)
		return NULL;
	if (PyDict_SetItemString(d, "SSLError", PySSLErrorObject) != 0)
		return NULL;
	if (PyDict_SetItemString(d, "SSLType",
				 (PyObject *)&PySSL_Type) != 0)
		return NULL;
	PyModule_AddIntConstant(m, "SSL_ERROR_ZERO_RETURN",
				PY_SSL_ERROR_ZERO_RETURN);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_READ",
				PY_SSL_ERROR_WANT_READ);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_WRITE",
				PY_SSL_ERROR_WANT_WRITE);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_X509_LOOKUP",
				PY_SSL_ERROR_WANT_X509_LOOKUP);
	PyModule_AddIntConstant(m, "SSL_ERROR_SYSCALL",
				PY_SSL_ERROR_SYSCALL);
	PyModule_AddIntConstant(m, "SSL_ERROR_SSL",
				PY_SSL_ERROR_SSL);
	PyModule_AddIntConstant(m, "SSL_ERROR_WANT_CONNECT",
				PY_SSL_ERROR_WANT_CONNECT);
	/* non ssl.h errorcodes */
	PyModule_AddIntConstant(m, "SSL_ERROR_EOF",
				PY_SSL_ERROR_EOF);
	PyModule_AddIntConstant(m, "SSL_ERROR_INVALID_ERROR_CODE",
				PY_SSL_ERROR_INVALID_ERROR_CODE);
	/* cert requirements */
	PyModule_AddIntConstant(m, "CERT_NONE",
				PY_SSL_CERT_NONE);
	PyModule_AddIntConstant(m, "CERT_OPTIONAL",
				PY_SSL_CERT_OPTIONAL);
	PyModule_AddIntConstant(m, "CERT_REQUIRED",
				PY_SSL_CERT_REQUIRED);

	/* protocol versions */
	PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
				PY_SSL_VERSION_SSL2);
	PyModule_AddIntConstant(m, "PROTOCOL_SSLv3",
				PY_SSL_VERSION_SSL3);
	PyModule_AddIntConstant(m, "PROTOCOL_SSLv23",
				PY_SSL_VERSION_SSL23);
	PyModule_AddIntConstant(m, "PROTOCOL_TLSv1",
				PY_SSL_VERSION_TLS1);
	return m;
}