-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathssl.c
968 lines (924 loc) · 31.3 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
// ssl.c -- Support functions that find and load SSL support, if available
// Copyright (C) 2008-2010 Markus Gutschke <[email protected]>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// In addition to these license terms, the author grants the following
// additional rights:
//
// If you modify this program, or any covered work, by linking or
// combining it with the OpenSSL project's OpenSSL library (or a
// modified version of that library), containing parts covered by the
// terms of the OpenSSL or SSLeay licenses, the author
// grants you additional permission to convey the resulting work.
// Corresponding Source for a non-source form of such a combination
// shall include the source code for the parts of OpenSSL used as well
// as that of the covered work.
//
// You may at your option choose to remove this additional permission from
// the work, or from any part of it.
//
// It is possible to build this program in a way that it loads OpenSSL
// libraries at run-time. If doing so, the following notices are required
// by the OpenSSL and SSLeay licenses:
//
// This product includes software developed by the OpenSSL Project
// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
//
// This product includes cryptographic software written by Eric Young
// ([email protected])
//
//
// The most up-to-date version of this program is always available from
// http://shellinabox.com
#define _GNU_SOURCE
#include "config.h"
#define pthread_once x_pthread_once
#define pthread_sigmask x_pthread_sigmask
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include "libhttp/ssl.h"
#include "libhttp/httpconnection.h"
#include "logging/logging.h"
#ifdef HAVE_UNUSED
#defined ATTR_UNUSED __attribute__((unused))
#defined UNUSED(x) do { } while (0)
#else
#define ATTR_UNUSED
#define UNUSED(x) do { (void)(x); } while (0)
#endif
#undef pthread_once
#undef pthread_sigmask
#if defined(HAVE_OPENSSL) && !defined(OPENSSL_NO_TLSEXT) && \
defined(TLSEXT_NAMETYPE_host_name) && defined(SSL_TLSEXT_ERR_OK)
#define HAVE_TLSEXT
#endif
#if defined(HAVE_PTHREAD_H)
// Pthread support is optional. Only enable it, if the library has been
// linked into the program
#include <pthread.h>
#if defined(__linux__)
extern int pthread_once(pthread_once_t *, void (*)(void))__attribute__((weak));
#endif
extern int pthread_sigmask(int, const sigset_t *, sigset_t *)
__attribute__((weak));
#endif
#if defined(HAVE_DLOPEN)
// SSL support is optional. Only enable it, if the library can be loaded.
long (*BIO_ctrl)(BIO *, int, long, void *);
BIO_METHOD * (*BIO_f_buffer)(void);
void (*BIO_free_all)(BIO *);
BIO * (*BIO_new)(BIO_METHOD *);
BIO * (*BIO_new_socket)(int, int);
BIO * (*BIO_pop)(BIO *);
BIO * (*BIO_push)(BIO *, BIO *);
void (*ERR_clear_error)(void);
void (*ERR_clear_error)(void);
unsigned long (*ERR_peek_error)(void);
unsigned long (*ERR_peek_error)(void);
long (*SSL_CTX_callback_ctrl)(SSL_CTX *, int, void (*)(void));
int (*SSL_CTX_check_private_key)(const SSL_CTX *);
long (*SSL_CTX_ctrl)(SSL_CTX *, int, long, void *);
void (*SSL_CTX_free)(SSL_CTX *);
SSL_CTX * (*SSL_CTX_new)(SSL_METHOD *);
int (*SSL_CTX_use_PrivateKey_file)(SSL_CTX *, const char *, int);
int (*SSL_CTX_use_PrivateKey_ASN1)(int, SSL_CTX *,
const unsigned char *, long);
int (*SSL_CTX_use_certificate_file)(SSL_CTX *, const char *, int);
int (*SSL_CTX_use_certificate_ASN1)(SSL_CTX *, long,
const unsigned char *);
long (*SSL_ctrl)(SSL *, int, long, void *);
void (*SSL_free)(SSL *);
int (*SSL_get_error)(const SSL *, int);
void * (*SSL_get_ex_data)(const SSL *, int);
BIO * (*SSL_get_rbio)(const SSL *);
const char * (*SSL_get_servername)(const SSL *, int);
BIO * (*SSL_get_wbio)(const SSL *);
int (*SSL_library_init)(void);
SSL * (*SSL_new)(SSL_CTX *);
int (*SSL_read)(SSL *, void *, int);
SSL_CTX * (*SSL_set_SSL_CTX)(SSL *, SSL_CTX *);
void (*SSL_set_accept_state)(SSL *);
void (*SSL_set_bio)(SSL *, BIO *, BIO *);
int (*SSL_set_ex_data)(SSL *, int, void *);
int (*SSL_shutdown)(SSL *);
int (*SSL_write)(SSL *, const void *, int);
SSL_METHOD * (*SSLv23_server_method)(void);
X509 * (*d2i_X509)(X509 **px, const unsigned char **in, int len);
void (*X509_free)(X509 *a);
#endif
static void sslDestroyCachedContext(void *ssl_, char *context_) {
struct SSLSupport *ssl = (struct SSLSupport *)ssl_;
SSL_CTX *context = (SSL_CTX *)context_;
#if defined(HAVE_OPENSSL)
if (context != ssl->sslContext) {
SSL_CTX_free(context);
}
#else
check(!context);
check(!ssl->sslContext);
#endif
}
struct SSLSupport *newSSL(void) {
struct SSLSupport *ssl;
check(ssl = malloc(sizeof(struct SSLSupport)));
initSSL(ssl);
return ssl;
}
void initSSL(struct SSLSupport *ssl) {
ssl->enabled = serverSupportsSSL();
ssl->sslContext = NULL;
ssl->sniCertificatePattern = NULL;
ssl->generateMissing = 0;
initTrie(&ssl->sniContexts, sslDestroyCachedContext, ssl);
}
void destroySSL(struct SSLSupport *ssl) {
if (ssl) {
free(ssl->sniCertificatePattern);
destroyTrie(&ssl->sniContexts);
#if defined(HAVE_OPENSSL)
if (ssl->sslContext) {
dcheck(!ERR_peek_error());
SSL_CTX_free(ssl->sslContext);
}
#else
check(!ssl->sslContext);
#endif
}
}
void deleteSSL(struct SSLSupport *ssl) {
destroySSL(ssl);
free(ssl);
}
#if defined(HAVE_OPENSSL) && defined(HAVE_DLOPEN)
static int maybeLoadCrypto(void) {
// Some operating systems cannot automatically load dependent dynamic
// libraries. As libssl.so can depend on libcrypto.so, we try to load
// it, iff we haven't tried loading it before and iff libssl.so does not
// work by itself.
static int crypto;
// SHELLINABOX_LIBCRYPTO_SO can be used to select the specific
// soname of libcrypto for systems where it is not libcrypto.so.
// The feature is currently disabled.
const char* path_libcrypto = NULL; // getenv ("SHELLINABOX_LIBCRYPTO_SO");
if (path_libcrypto == NULL)
path_libcrypto = "libcrypto.so";
if (!crypto++) {
#ifdef RTLD_NOLOAD
if (dlopen(path_libcrypto, RTLD_LAZY|RTLD_GLOBAL|RTLD_NOLOAD))
return 1;
else
#endif
if (dlopen(path_libcrypto, RTLD_LAZY|RTLD_GLOBAL))
return 1;
}
return 0;
}
static void *loadSymbol(const char *lib, const char *fn) {
int err = NOINTR(dup(2));
if (err > 2) {
int null = NOINTR(open("/dev/null", O_WRONLY));
if (null >= 0) {
NOINTR(dup2(null, 2));
NOINTR(close(null));
}
}
void *dl = RTLD_DEFAULT;
void *rc = dlsym(dl, fn);
if (!rc) {
for (int i = 0; i < 2; i++) {
#ifdef RTLD_NOLOAD
dl = dlopen(lib, RTLD_LAZY|RTLD_GLOBAL|RTLD_NOLOAD);
#else
dl = NULL;
#endif
if (dl == NULL) {
dl = dlopen(lib, RTLD_LAZY|RTLD_GLOBAL);
}
if (dl != NULL || !maybeLoadCrypto()) {
break;
}
}
if (dl != NULL) {
rc = dlsym(RTLD_DEFAULT, fn);
if (rc == NULL && maybeLoadCrypto()) {
rc = dlsym(RTLD_DEFAULT, fn);
}
}
}
if (err > 2) {
NOINTR(dup2(err, 2));
}
NOINTR(close(err));
return rc;
}
static void loadSSL(void) {
// SHELLINABOX_LIBSSL_SO can be used to select the specific
// soname of libssl for systems where it is not libssl.so.
// The feature is currently disabled.
const char* path_libssl = NULL; // = getenv ("SHELLINABOX_LIBSSL_SO");
if (path_libssl == NULL)
path_libssl = "libssl.so";
check(!SSL_library_init);
struct {
union {
void *avoid_gcc_warning_about_type_punning;
void **var;
};
const char *fn;
} symbols[] = {
{ { &BIO_ctrl }, "BIO_ctrl" },
{ { &BIO_f_buffer }, "BIO_f_buffer" },
{ { &BIO_free_all }, "BIO_free_all" },
{ { &BIO_new }, "BIO_new" },
{ { &BIO_new_socket }, "BIO_new_socket" },
{ { &BIO_pop }, "BIO_pop" },
{ { &BIO_push }, "BIO_push" },
{ { &ERR_clear_error }, "ERR_clear_error" },
{ { &ERR_clear_error }, "ERR_clear_error" },
{ { &ERR_peek_error }, "ERR_peek_error" },
{ { &ERR_peek_error }, "ERR_peek_error" },
{ { &SSL_CTX_callback_ctrl }, "SSL_CTX_callback_ctrl" },
{ { &SSL_CTX_check_private_key }, "SSL_CTX_check_private_key" },
{ { &SSL_CTX_ctrl }, "SSL_CTX_ctrl" },
{ { &SSL_CTX_free }, "SSL_CTX_free" },
{ { &SSL_CTX_new }, "SSL_CTX_new" },
{ { &SSL_CTX_use_PrivateKey_file }, "SSL_CTX_use_PrivateKey_file" },
{ { &SSL_CTX_use_PrivateKey_ASN1 }, "SSL_CTX_use_PrivateKey_ASN1" },
{ { &SSL_CTX_use_certificate_file },"SSL_CTX_use_certificate_file"},
{ { &SSL_CTX_use_certificate_ASN1 },"SSL_CTX_use_certificate_ASN1"},
{ { &SSL_ctrl }, "SSL_ctrl" },
{ { &SSL_free }, "SSL_free" },
{ { &SSL_get_error }, "SSL_get_error" },
{ { &SSL_get_ex_data }, "SSL_get_ex_data" },
{ { &SSL_get_rbio }, "SSL_get_rbio" },
#ifdef HAVE_TLSEXT
{ { &SSL_get_servername }, "SSL_get_servername" },
#endif
{ { &SSL_get_wbio }, "SSL_get_wbio" },
{ { &SSL_library_init }, "SSL_library_init" },
{ { &SSL_new }, "SSL_new" },
{ { &SSL_read }, "SSL_read" },
#ifdef HAVE_TLSEXT
{ { &SSL_set_SSL_CTX }, "SSL_set_SSL_CTX" },
#endif
{ { &SSL_set_accept_state }, "SSL_set_accept_state" },
{ { &SSL_set_bio }, "SSL_set_bio" },
{ { &SSL_set_ex_data }, "SSL_set_ex_data" },
{ { &SSL_shutdown }, "SSL_shutdown" },
{ { &SSL_write }, "SSL_write" },
{ { &SSLv23_server_method }, "SSLv23_server_method" },
{ { &d2i_X509 }, "d2i_X509" },
{ { &X509_free }, "X509_free" }
};
for (unsigned i = 0; i < sizeof(symbols)/sizeof(symbols[0]); i++) {
if (!(*symbols[i].var = loadSymbol(path_libssl, symbols[i].fn))) {
debug("Failed to load SSL support. Could not find \"%s\"",
symbols[i].fn);
for (unsigned j = 0; j < sizeof(symbols)/sizeof(symbols[0]); j++) {
*symbols[j].var = NULL;
}
return;
}
}
SSL_library_init();
dcheck(!ERR_peek_error());
debug("Loaded SSL suppport");
}
#endif
int serverSupportsSSL(void) {
#if defined(HAVE_OPENSSL) && !defined(HAVE_DLOPEN)
return SSL_library_init();
#else
#if defined(HAVE_OPENSSL)
// We want to call loadSSL() exactly once. For single-threaded applications,
// this is straight-forward. For threaded applications, we need to call
// pthread_once(), instead. We perform run-time checks for whether we are
// single- or multi-threaded, so that the same code can be used.
// This currently only works on Linux.
#if defined(HAVE_PTHREAD_H) && defined(__linux__) && defined(__i386__)
if (!!&pthread_once) {
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, loadSSL);
} else
#endif
{
static int initialized;
if (!initialized) {
initialized = 1;
loadSSL();
}
}
return !!SSL_library_init;
#else
return 0;
#endif
#endif
}
#if defined(HAVE_OPENSSL)
static void sslGenerateCertificate(const char *certificate,
const char *serverName) {
debug("Auto-generating missing certificate \"%s\" for \"%s\"",
certificate, serverName);
pid_t pid = fork();
if (pid == -1) {
warn("Failed to generate self-signed certificate \"%s\"", certificate);
} else if (pid == 0) {
int fd = NOINTR(open("/dev/null", O_RDONLY));
check(fd != -1);
check(NOINTR(dup2(fd, STDERR_FILENO)) == STDERR_FILENO);
check(NOINTR(close(fd)) == 0);
fd = NOINTR(open("/dev/null", O_WRONLY));
check(fd != -1);
check(NOINTR(dup2(fd, STDIN_FILENO)) == STDIN_FILENO);
check(NOINTR(close(fd)) == 0);
umask(077);
check(setenv("PATH", "/usr/bin:/usr/sbin", 1) == 0);
execlp("openssl", "openssl", "req", "-x509", "-nodes", "-days", "7300",
"-newkey", "rsa:2048", "-keyout", certificate, "-out", certificate,
"-subj", stringPrintf(NULL, "/CN=%s/", serverName),
(char *)NULL);
check(0);
} else {
int status;
check(NOINTR(waitpid(pid, &status, 0)) == pid);
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
warn("Failed to generate self-signed certificate \"%s\"", certificate);
}
}
static const unsigned char *sslSecureReadASCIIFileToMem(int fd) {
size_t inc = 16384;
size_t bufSize = inc;
size_t len = 0;
unsigned char *buf;
check((buf = malloc(bufSize)) != NULL);
for (;;) {
check(len < bufSize - 1);
ssize_t readLen = bufSize - len - 1;
ssize_t bytesRead = NOINTR(read(fd, buf + len, readLen));
if (bytesRead > 0) {
len += bytesRead;
}
if (bytesRead != readLen) {
break;
}
// Instead of calling realloc(), allocate a new buffer, copy the data,
// and then clear the old buffer. This way, we are not accidentally
// leaving key material in memory.
unsigned char *newBuf;
check((newBuf = malloc(bufSize + inc)) != NULL);
memcpy(newBuf, buf, len);
memset(buf, 0, bufSize);
free(buf);
buf = newBuf;
bufSize += inc;
}
check(len < bufSize);
buf[len] = '\000';
return buf;
}
static const unsigned char *sslPEMtoASN1(const unsigned char *pem,
const char *record,
long *size,
const unsigned char **eor) {
if (eor) {
*eor = NULL;
}
*size = 0;
char *marker;
check((marker = stringPrintf(NULL, "-----BEGIN %s-----",record))!=NULL);
unsigned char *ptr = (unsigned char *)strstr((char *)pem, marker);
if (!ptr) {
free(marker);
return NULL;
} else {
ptr += strlen(marker);
}
*marker = '\000';
check((marker = stringPrintf(marker, "-----END %s-----",record))!=NULL);
unsigned char *end = (unsigned char *)strstr((char *)ptr, marker);
if (eor) {
*eor = end + strlen(marker);
}
free(marker);
if (!end) {
return NULL;
}
unsigned char *ret;
ssize_t maxSize = (((end - ptr)*6)+7)/8;
check((ret = malloc(maxSize)) != NULL);
unsigned char *out = ret;
unsigned bits = 0;
int count = 0;
while (ptr < end) {
unsigned char ch = *ptr++;
if (ch >= 'A' && ch <= 'Z') {
ch -= 'A';
} else if (ch >= 'a' && ch <= 'z') {
ch -= 'a' - 26;
} else if (ch >= '0' && ch <= '9') {
ch += 52 - '0';
} else if (ch == '+') {
ch += 62 - '+';
} else if (ch == '/') {
ch += 63 - '/';
} else if (ch == '=') {
while (ptr < end) {
if ((ch = *ptr++) != '=' && ch > ' ') {
goto err;
}
}
break;
} else if (ch <= ' ') {
continue;
} else {
err:
free(ret);
return NULL;
}
check(ch <= 63);
check(count >= 0);
check(count <= 6);
bits = (bits << 6) | ch;
count += 6;
if (count >= 8) {
*out++ = (bits >> (count -= 8)) & 0xFF;
}
}
check(out - ret <= maxSize);
*size = out - ret;
return ret;
}
static int sslSetCertificateFromFd(SSL_CTX *context, int fd) {
int rc = 0;
check(serverSupportsSSL());
check(fd >= 0);
const unsigned char *data = sslSecureReadASCIIFileToMem(fd);
check(!NOINTR(close(fd)));
long dataSize = (long)strlen((const char *)data);
long certSize, rsaSize, dsaSize, ecSize, notypeSize;
const unsigned char *record;
const unsigned char *cert = sslPEMtoASN1(data, "CERTIFICATE", &certSize,
&record);
const unsigned char *rsa = sslPEMtoASN1(data, "RSA PRIVATE KEY",&rsaSize,
NULL);
const unsigned char *dsa = sslPEMtoASN1(data, "DSA PRIVATE KEY",&dsaSize,
NULL);
const unsigned char *ec = sslPEMtoASN1(data, "EC PRIVATE KEY", &ecSize,
NULL);
const unsigned char *notype = sslPEMtoASN1(data, "PRIVATE KEY", ¬ypeSize,
NULL);
if (certSize && (rsaSize || dsaSize
#ifdef EVP_PKEY_EC
|| ecSize
#endif
|| notypeSize) &&
SSL_CTX_use_certificate_ASN1(context, certSize, cert) &&
(!rsaSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_RSA, context, rsa, rsaSize)) &&
(!dsaSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_DSA, context, dsa, dsaSize)) &&
#ifdef EVP_PKEY_EC
(!ecSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_EC, context, ec, ecSize)) &&
#endif
// Assume a private key is RSA if the header does not specify a type.
// (e.g. BEGIN PRIVATE KEY)
(!notypeSize ||
SSL_CTX_use_PrivateKey_ASN1(EVP_PKEY_RSA, context, notype, notypeSize))
) {
memset((char *)cert, 0, certSize);
free((char *)cert);
while (record) {
cert = sslPEMtoASN1(record, "CERTIFICATE", &certSize,
&record);
if (cert) {
X509 *x509;
const unsigned char *c = cert;
check(x509 = d2i_X509(NULL, &c, certSize));
memset((char *)cert, 0, certSize);
free((char *)cert);
if (!SSL_CTX_add_extra_chain_cert(context, x509)) {
X509_free(x509);
break;
}
}
}
if (!record && SSL_CTX_check_private_key(context)) {
rc = 1;
}
dcheck(!ERR_peek_error());
ERR_clear_error();
} else {
memset((char *)cert, 0, certSize);
free((char *)cert);
}
memset((char *)data, 0, dataSize);
free((char *)data);
memset((char *)rsa, 0, rsaSize);
free((char *)rsa);
memset((char *)dsa, 0, dsaSize);
free((char *)dsa);
memset((char *)ec, 0, ecSize);
free((char *)ec);
memset((char *)notype, 0, notypeSize);
free((char *)notype);
return rc;
}
static int sslSetCertificateFromFile(SSL_CTX *context,
const char *filename) {
int fd = open(filename, O_RDONLY);
if (fd < 0) {
return -1;
}
int rc = sslSetCertificateFromFd(context, fd);
return rc;
}
#endif
#ifdef HAVE_TLSEXT
static int sslSNICallback(SSL *sslHndl, int *al ATTR_UNUSED,
struct SSLSupport *ssl) {
UNUSED(al);
check(!ERR_peek_error());
const char *name = SSL_get_servername(sslHndl,
TLSEXT_NAMETYPE_host_name);
if (name == NULL || !*name) {
return SSL_TLSEXT_ERR_OK;
}
struct HttpConnection *http =
(struct HttpConnection *)SSL_get_app_data(sslHndl);
debug("Received SNI callback for virtual host \"%s\" from \"%s:%d\"",
name, httpGetPeerName(http), httpGetPort(http));
char *serverName;
check(serverName = malloc(strlen(name)+2));
serverName[0] = '-';
for (int i = 0;;) {
char ch = name[i];
if (ch >= 'A' && ch <= 'Z') {
ch |= 0x20;
} else if (ch != '\000' && ch != '.' && ch != '-' &&
(ch < '0' ||(ch > '9' && ch < 'A') || (ch > 'Z' &&
ch < 'a')|| ch > 'z')) {
free(serverName);
return SSL_TLSEXT_ERR_OK;
}
serverName[++i] = ch;
if (!ch) {
break;
}
}
SSL_CTX *context = (SSL_CTX *)getFromTrie(&ssl->sniContexts,
serverName+1,
NULL);
if (context == NULL) {
check(context = SSL_CTX_new(SSLv23_server_method()));
check(ssl->sniCertificatePattern);
char *certificate = stringPrintfUnchecked(NULL,
ssl->sniCertificatePattern,
serverName);
if (sslSetCertificateFromFile(context, certificate) < 0) {
if (ssl->generateMissing) {
sslGenerateCertificate(certificate, serverName + 1);
// No need to check the certificate. If we fail to set it, we will use
// the default certificate, instead.
sslSetCertificateFromFile(context, certificate);
} else {
warn("Could not find matching certificate \"%s\" for \"%s\"",
certificate, serverName + 1);
SSL_CTX_free(context);
context = ssl->sslContext;
}
}
ERR_clear_error();
free(certificate);
addToTrie(&ssl->sniContexts, serverName+1, (char *)context);
}
free(serverName);
if (context != ssl->sslContext) {
check(SSL_set_SSL_CTX(sslHndl, context));
}
check(!ERR_peek_error());
return SSL_TLSEXT_ERR_OK;
}
#endif
#if defined(HAVE_OPENSSL) && !defined(HAVE_GETHOSTBYNAME_R)
// This is a not-thread-safe replacement for gethostbyname_r()
#define gethostbyname_r x_gethostbyname_r
static int gethostbyname_r(const char *name, struct hostent *ret,
char *buf ATTR_UNUSED, size_t buflen ATTR_UNUSED,
struct hostent **result, int *h_errnop) {
UNUSED(buf);
UNUSED(buflen);
if (result) {
*result = NULL;
}
if (h_errnop) {
*h_errnop = ERANGE;
}
if (!ret) {
return -1;
}
struct hostent *he = gethostbyname(name);
if (he) {
*ret = *he;
if (result) {
*result = ret;
}
}
if (h_errnop) {
*h_errnop = h_errno;
}
return he ? 0 : -1;
}
#endif
void sslSetCertificate(struct SSLSupport *ssl, const char *filename,
int autoGenerateMissing) {
#if defined(HAVE_OPENSSL)
check(serverSupportsSSL());
char *defaultCertificate;
check(defaultCertificate = strdup(filename));
char *ptr = strchr(defaultCertificate, '%');
if (ptr != NULL) {
check(!strchr(ptr+1, '%'));
check(ptr[1] == 's');
memmove(ptr, ptr + 2, strlen(ptr)-1);
}
// Try to set the default certificate. If necessary, (re-)generate it.
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
if (autoGenerateMissing) {
if (sslSetCertificateFromFile(ssl->sslContext, defaultCertificate) < 0) {
char hostname[256], buf[4096];
check(!gethostname(hostname, sizeof(hostname)));
struct hostent he_buf, *he;
int h_err = 0;
int ret = gethostbyname_r(hostname, &he_buf, buf, sizeof(buf), &he, &h_err);
if (!ret && he && he->h_name) {
sslGenerateCertificate(defaultCertificate, he->h_name);
} else {
if (h_err) {
warn("Error getting host information: \"%s\".", hstrerror(h_err));
}
sslGenerateCertificate(defaultCertificate, hostname);
}
} else {
goto valid_certificate;
}
}
if (sslSetCertificateFromFile(ssl->sslContext, defaultCertificate) < 0) {
fatal("Cannot read valid certificate from \"%s\". "
"Check file permissions and file format.", defaultCertificate);
}
valid_certificate:
free(defaultCertificate);
// Enable SNI support so that we can set a different certificate, if the
// client asked for it.
#ifdef HAVE_TLSEXT
if (ptr != NULL) {
check(ssl->sniCertificatePattern = strdup(filename));
check(SSL_CTX_set_tlsext_servername_callback(ssl->sslContext,
sslSNICallback));
check(SSL_CTX_set_tlsext_servername_arg(ssl->sslContext, ssl));
}
#endif
dcheck(!ERR_peek_error());
ERR_clear_error();
ssl->generateMissing = autoGenerateMissing;
#endif
}
// Convert the file descriptor to a human-readable format. Attempts to
// retrieve the original file name where possible.
#ifdef HAVE_OPENSSL
static char *sslFdToFilename(int fd) {
char *proc, *buf;
int len = 128;
check(proc = stringPrintf(NULL, "/proc/self/fd/%d", fd));
check(buf = malloc(len));
for (;;) {
ssize_t i;
if ((i = readlink(proc, buf + 1, len-3)) < 0) {
free(proc);
free(buf);
check(buf = stringPrintf(NULL, "fd %d", fd));
return buf;
} else if (i >= len-3) {
len += 512;
check(buf = realloc(buf, len));
} else {
free(proc);
check(i >= 0 && i < len);
buf[i+1] = '\000';
struct stat sb;
if (!stat(buf + 1, &sb) && S_ISREG(sb.st_mode)) {
*buf = '"';
buf[i + 1] = '"';
buf[i + 2] = '\000';
return buf;
} else {
free(buf);
check(buf = stringPrintf(NULL, "fd %d", fd));
return buf;
}
}
}
}
#endif
void sslSetCertificateFd(struct SSLSupport *ssl, int fd) {
#ifdef HAVE_OPENSSL
check(ssl->sslContext = SSL_CTX_new(SSLv23_server_method()));
char *filename = sslFdToFilename(fd);
if (!sslSetCertificateFromFd(ssl->sslContext, fd)) {
fatal("Cannot read valid certificate from %s. Check file format.",
filename);
}
free(filename);
ssl->generateMissing = 0;
#endif
}
int sslEnable(struct SSLSupport *ssl, int enabled) {
int old = ssl->enabled;
ssl->enabled = enabled;
return old;
}
void sslBlockSigPipe(void) {
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGPIPE);
#if defined(HAVE_PTHREAD_H) && defined(__linux__) && defined(__i386__)
if (&pthread_sigmask) {
dcheck(!pthread_sigmask(SIG_BLOCK, &set, NULL));
} else
#endif
{
dcheck(!sigprocmask(SIG_BLOCK, &set, NULL));
}
}
#ifndef HAVE_SIGWAIT
// This is a non-thread-safe replacement for sigwait()
static int dummysignalno;
static void dummysignal(int signo) {
dummysignalno = signo;
}
#define sigwait x_sigwait
static int sigwait(const sigset_t *set, int *sig) {
sigset_t mask, old_mask;
sigfillset(&mask);
#if defined(HAVE_PTHREAD_H) && defined(__linux__) && defined(__i386__)
if (&pthread_sigmask) {
dcheck(!pthread_sigmask(SIG_BLOCK, &mask, &old_mask));
} else
#endif
{
dcheck(!sigprocmask(SIG_BLOCK, &mask, &old_mask));
}
#ifndef NSIG
#define NSIG 32
#endif
struct sigaction sa[NSIG];
memset(sa, 0, sizeof(sa));
sa->sa_handler = dummysignal;
for (int i = 1; i <= NSIG; i++) {
if (sigismember(set, i)) {
sigdelset(&mask, i);
sigaction(i, sa, sa + i);
}
}
dummysignalno = -1;
sigsuspend(&mask);
#if defined(HAVE_PTHREAD_H) && defined(__linux__) && defined(__i386__)
if (&pthread_sigmask) {
dcheck(!pthread_sigmask(SIG_SETMASK, &old_mask, NULL));
} else
#endif
{
dcheck(!sigprocmask(SIG_BLOCK, &old_mask, NULL));
}
return dummysignalno;
}
#endif
int sslUnblockSigPipe(void) {
int signum = 0;
sigset_t set;
check(!sigpending(&set));
if (sigismember(&set, SIGPIPE)) {
sigwait(&set, &signum);
}
sigemptyset(&set);
sigaddset(&set, SIGPIPE);
#if defined(HAVE_PTHREAD_H) && defined(__linux__) && defined(__i386__)
if (&pthread_sigmask) {
dcheck(!pthread_sigmask(SIG_UNBLOCK, &set, NULL));
} else
#endif
{
dcheck(!sigprocmask(SIG_UNBLOCK, &set, NULL));
}
return signum;
}
int sslPromoteToSSL(struct SSLSupport *ssl, SSL **sslHndl, int fd,
const char *buf, int len) {
#if defined(HAVE_OPENSSL)
sslBlockSigPipe();
int rc = 0;
check(!*sslHndl);
dcheck(!ERR_peek_error());
dcheck(*sslHndl = SSL_new(ssl->sslContext));
if (*sslHndl == NULL) {
ERR_clear_error();
errno = EINVAL;
rc = -1;
} else {
SSL_set_mode(*sslHndl, SSL_MODE_ENABLE_PARTIAL_WRITE);
BIO *writeBIO = BIO_new_socket(fd, 0);
BIO *readBIO = writeBIO;
if (len > 0) {
readBIO = BIO_new(BIO_f_buffer());
BIO_push(readBIO, writeBIO);
check(BIO_set_buffer_read_data(readBIO, (char *)buf, len));
}
SSL_set_bio(*sslHndl, readBIO, writeBIO);
SSL_set_accept_state(*sslHndl);
dcheck(!ERR_peek_error());
}
sslUnblockSigPipe();
return rc;
#else
errno = EINVAL;
return -1;
#endif
}
void sslFreeHndl(SSL **sslHndl) {
#if defined(HAVE_OPENSSL)
if (*sslHndl) {
// OpenSSL does not always correctly perform reference counting for stacked
// BIOs. This is particularly a problem if an SSL connection has two
// different BIOs for the read and the write end, with one being a stacked
// derivative of the other. Unfortunately, this is exactly the scenario
// that we set up.
// As a work-around, we un-stack the BIOs prior to freeing the SSL
// connection.
ERR_clear_error();
BIO *writeBIO, *readBIO;
check(writeBIO = SSL_get_wbio(*sslHndl));
check(readBIO = SSL_get_rbio(*sslHndl));
if (writeBIO != readBIO) {
if (readBIO->next_bio == writeBIO) {
// OK, that's exactly the bug we are looking for. We know how to
// fix it.
check(BIO_pop(readBIO) == writeBIO);
check(readBIO->references == 1);
check(writeBIO->references == 1);
check(!readBIO->next_bio);
check(!writeBIO->prev_bio);
} else if (readBIO->next_bio == writeBIO->next_bio &&
writeBIO->next_bio->prev_bio == writeBIO) {
// Things get even more confused, if the SSL handshake is aborted
// prematurely.
// OpenSSL appears to internally stack a BIO onto the read end that
// does not get removed afterwards. We end up with the original
// socket BIO having two different BIOs prepended to it (one for
// reading and one for writing). In this case, not only is the
// reference count wrong, but the chain of next_bio/prev_bio pairs
// is corrupted, too.
BIO *sockBIO;
check(sockBIO = BIO_pop(readBIO));
check(sockBIO == BIO_pop(writeBIO));
check(readBIO->references == 1);
check(writeBIO->references == 1);
check(sockBIO->references == 1);
check(!readBIO->next_bio);
check(!writeBIO->next_bio);
check(!sockBIO->prev_bio);
BIO_free_all(sockBIO);
} else {
// We do not know, how to fix this situation. Something must have
// changed in the OpenSSL internals. Either, this is a new bug, or
// somebody fixed the code in a way that we did not anticipate.
fatal("Unexpected corruption of OpenSSL data structures");
}
}
SSL_free(*sslHndl);
dcheck(!ERR_peek_error());
}
#endif
*sslHndl = NULL;
}