summaryrefslogtreecommitdiffstats
path: root/nanohttp/nanohttp-ssl.c
blob: a92485fbcc818dab04eb381864956d6d02918751 (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
/** @file nanohttp-ssl.c SSL wrapper */
/******************************************************************
*  $Id: nanohttp-ssl.c,v 1.38 2007/11/03 22:40:15 m0gg Exp $
*
* CSOAP Project:  A http client/server library in C
* Copyright (C) 2001-2005  Rochester Institute of Technology
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA  02111-1307, USA.
*
* Author: Matt Campbell
******************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef HAVE_STRING_H
#include <string.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#ifdef HAVE_TIME_H
#include <time.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_IO_H
#include <io.h>
#endif

#ifdef HAVE_OPENSSL_SSL_H
#include <openssl/ssl.h>
#endif

#ifdef HAVE_OPENSSL_RAND_H
#include <openssl/rand.h>
#endif

#ifdef HAVE_OPENSSL_ERR_H
#include <openssl/err.h>
#endif

#include "nanohttp-error.h"
#include "nanohttp-common.h"
#include "nanohttp-socket.h"
#include "nanohttp-logging.h"

#include "nanohttp-ssl.h"

#define CERT_SUBJECT	1

static char *_hssl_certificate = NULL;
static char *_hssl_certpass = NULL;
static char *_hssl_ca_list = NULL;
static SSL_CTX *_hssl_context = NULL;
static int _hssl_enabled = 0;

static int
_hssl_dummy_verify_cert(X509 * cert)
{
  /* TODO: Make sure that the client is providing a client cert, or that the
     Module is providing the Module cert */

  /* connect to anyone */

  log_verbose("_Not_ validating certificate.");
  return 1;
}

int (*_hssl_verify_cert) (X509 * cert) = _hssl_dummy_verify_cert;

static int
_hssl_cert_verify_callback(int prev_ok, X509_STORE_CTX * ctx)
{
/*
    if ((X509_STORE_CTX_get_error(ctx) = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN))
    {
        log_verbose("Self signed cert in chain");
        return 1;
    }
*/
  log_verbose("Cert depth = %d", X509_STORE_CTX_get_error_depth(ctx));
  if (X509_STORE_CTX_get_error_depth(ctx) == 0)
  {
    return _hssl_verify_cert(X509_STORE_CTX_get_current_cert(ctx));
  }
  else
  {
    log_verbose("Cert ok (prev)");
    return prev_ok;
  }
}

static void
_hssl_superseed(void)
{
  int buf[256], i;

  srand(time(NULL));

  for (i = 0; i < 256; i++)
  {
    buf[i] = rand();
  }
  RAND_seed((unsigned char *) buf, sizeof(buf));

  return;
}

static char *
_hssl_get_error(SSL * ssl, int ret)
{
  switch (SSL_get_error(ssl, ret))
  {
  case SSL_ERROR_NONE:
    return "None";
  case SSL_ERROR_ZERO_RETURN:
    return "Zero return";
  case SSL_ERROR_WANT_READ:
    return "Want read";
  case SSL_ERROR_WANT_WRITE:
    return "Want write";
  case SSL_ERROR_WANT_X509_LOOKUP:
    return "Want x509 lookup";
  case SSL_ERROR_SYSCALL:
    if (ERR_get_error() == 0 && ret == -1)
    {
      return strerror(errno);
    }
    return "Syscall failed";
  case SSL_ERROR_SSL:
    return "SSL error";
  default:
    return "Unkown error";
  }
}

static int
_hssl_password_callback(char *buf, int num, int rwflag, void *userdata)
{
  int ret;

  if (!_hssl_certpass)
    return 0;

  ret = strlen(_hssl_certpass);

  if (num < ret + 1)
    return 0;

  strcpy(buf, _hssl_certpass);

  return ret;
}

int
verify_sn(X509 * cert, int who, int nid, char *str)
{
  char name[256];
  char buf[256];

  memset(name, '\0', 256);
  memset(buf, '\0', 256);

  if (who == CERT_SUBJECT)
  {
    X509_NAME_oneline(X509_get_subject_name(cert), name, 256);
  }
  else
  {
    X509_NAME_oneline(X509_get_issuer_name(cert), name, 256);
  }

  buf[0] = '/';
  strcat(buf, OBJ_nid2sn(nid));
  strcat(buf, "=");
  strcat(buf, str);

  return strstr(name, buf) ? 1 : 0;
}

void
hssl_set_hssl_verify_cert(int func(X509 * cert))
{
  _hssl_verify_cert = func;

  return;
}

void
hssl_set_certificate(const char *filename)
{
  if (_hssl_certificate)
    free(_hssl_certificate);

  _hssl_certificate = strdup(filename);

  return;
}

void
hssl_set_certpass(const char *password)
{
  if (_hssl_certpass)
    free(_hssl_certpass);

  _hssl_certpass = strdup(password);

  return;
}

void
hssl_set_ca_list(const char *filename)
{
  if (_hssl_ca_list)
    free(_hssl_ca_list);

  _hssl_ca_list = strdup(filename);

  return;
}

void
hssl_enable(void)
{
  _hssl_enabled = 1;

  return;
}

static void
_hssl_parse_arguments(int argc, char **argv)
{
  int i;

  for (i=1; i<argc; i++)
  {
    if (!strcmp(argv[i - 1], NHTTP_ARG_CERT))
    {
      hssl_set_certificate(argv[i]);
    }
    else if (!strcmp(argv[i - 1], NHTTP_ARG_CERTPASS))
    {
      hssl_set_certpass(argv[i]);
    }
    else if (!strcmp(argv[i - 1], NHTTP_ARG_CA))
    {
      hssl_set_ca_list(argv[i]);
    }
    else if (!strcmp(argv[i - 1], NHTTPD_ARG_HTTPS))
    {
      hssl_enable();
    }
  }

  return;
}

static void
_hssl_library_init(void)
{
  static int initialized = 0;

  if (!initialized)
  {
    log_verbose("Initializing library");

    SSL_library_init();

    SSL_load_error_strings();
    ERR_load_crypto_strings();

    OpenSSL_add_ssl_algorithms();

    initialized = 1;
  }

  return;
}

static herror_t
_hssl_server_context_init(void)
{
  log_verbose("enabled=%i, certificate=%p", _hssl_enabled, _hssl_certificate);

  if (!_hssl_enabled || !_hssl_certificate)
    return H_OK;

  if (!(_hssl_context = SSL_CTX_new(SSLv23_method())))
  {
    log_error("Cannot create SSL context");
    return herror_new("_hssl_server_context_init", HSSL_ERROR_CONTEXT,
                      "Unable to create SSL context");
  }

  if (!(SSL_CTX_use_certificate_file(_hssl_context, _hssl_certificate, SSL_FILETYPE_PEM)))
  {
    log_error("Cannot read certificate file: \"%s\"", _hssl_certificate);
    SSL_CTX_free(_hssl_context);
    return herror_new("_hssl_server_context_init", HSSL_ERROR_CERTIFICATE,
                      "Unable to use SSL certificate \"%s\"", _hssl_certificate);
  }

  SSL_CTX_set_default_passwd_cb(_hssl_context, _hssl_password_callback);

  if (!(SSL_CTX_use_PrivateKey_file(_hssl_context, _hssl_certificate, SSL_FILETYPE_PEM)))
  {
    log_error("Cannot read key file: \"%s\"", _hssl_certificate);
    SSL_CTX_free(_hssl_context);
    return herror_new("_hssl_server_context_init", HSSL_ERROR_PEM,
                      "Unable to use private key");
  }

  if (_hssl_ca_list != NULL && *_hssl_ca_list != '\0')
  {
    if (!(SSL_CTX_load_verify_locations(_hssl_context, _hssl_ca_list, NULL)))
    {
      SSL_CTX_free(_hssl_context);
      log_error("Cannot read CA list: \"%s\"", _hssl_ca_list);
      return herror_new("_hssl_server_context_init", HSSL_ERROR_CA_LIST,
                        "Unable to read certification authorities \"%s\"");
    }

    SSL_CTX_set_client_CA_list(_hssl_context, SSL_load_client_CA_file(_hssl_ca_list));
    log_verbose("Certification authority contacted");
  }

  SSL_CTX_set_verify(_hssl_context, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE,
                     _hssl_cert_verify_callback);
  log_verbose("Certificate verification callback registered");

  SSL_CTX_set_mode(_hssl_context, SSL_MODE_AUTO_RETRY);

  SSL_CTX_set_session_cache_mode(_hssl_context, SSL_SESS_CACHE_OFF);

  _hssl_superseed();

  return H_OK;
}

static void
_hssl_server_context_destroy(void)
{
  if (_hssl_context)
  {
    SSL_CTX_free(_hssl_context);
    _hssl_context = NULL;
  }
  return;
}

herror_t
hssl_module_init(int argc, char **argv)
{
  _hssl_parse_arguments(argc, argv);

  if (_hssl_enabled)
  {
    _hssl_library_init();
    log_verbose("SSL enabled");
  }
  else
  {
    log_verbose("SSL _not_ enabled");
  }

  return _hssl_server_context_init();
}

void
hssl_module_destroy(void)
{
  _hssl_server_context_destroy();

  if (_hssl_certpass)
  {
    free(_hssl_certpass);
    _hssl_certpass = NULL;
  }

  if (_hssl_ca_list)
  {
    free(_hssl_ca_list);
    _hssl_ca_list = NULL;
  }

  if (_hssl_certificate)
  {
    free(_hssl_certificate);
    _hssl_certificate = NULL;
  }

  return;
}

int
hssl_enabled(void)
{
  return _hssl_enabled;
}

herror_t
hssl_client_ssl(struct hsocket_t * sock)
{
  SSL_CTX *ctx;
  SSL *ssl;
  int ret;

  log_verbose("Starting SSL client initialization");

  _hssl_library_init();

  if (!(ctx = SSL_CTX_new(SSLv23_method())))
  {
    log_error("SSL_CTX_new failed (ctx == %p)", ctx);
    return herror_new("hssl_client_ssl", HSSL_ERROR_CONTEXT, "Cannot create SSL client context");
  }

  if (!(ssl = SSL_new(ctx)))
  {
    log_error("Cannot create new SSL object");
    return herror_new("hssl_client_ssl", HSSL_ERROR_CLIENT, "SSL_new failed");
  }

  SSL_set_fd(ssl, sock->sock);

  if ((ret = SSL_connect(ssl)) <= 0)
  {
    herror_t err;

    log_error("SSL connect error (%s)", _hssl_get_error(ssl, -1));
    err =
      herror_new("hssl_client_ssl", HSSL_ERROR_CONNECT,
                 "SSL_connect failed (%s)", _hssl_get_error(ssl, ret));
    SSL_free(ssl);
    return err;
  }

  /* SSL_connect should take care of this for us. if
     (SSL_get_peer_certificate(ssl) == NULL) { log_error("No certificate
     provided"); SSL_free(ssl); return herror_new("hssl_client_ssl",
     HSSL_ERROR_CERTIFICATE, "No certificate provided"); }

     if (SSL_get_verify_result(ssl) != X509_V_OK) { log_error("Certificate
     did not verify"); SSL_free(ssl); return herror_new("hssl_client_ssl",
     HSSL_ERROR_CERTIFICATE, "Verfiy certificate failed"); } */

  log_verbose("SSL client initialization completed");

  sock->ssl = ssl;

  return H_OK;
}

static int
_hssl_bio_read(BIO * b, char *out, int outl)
{
  return hsocket_select_recv(b->num, out, outl);;
}

herror_t
hssl_server_ssl(struct hsocket_t *sock)
{
  SSL *ssl;
  int ret;
  BIO *sbio;

  if (!_hssl_enabled)
    return H_OK;

  log_verbose("Starting SSL initialization for socket %d", sock->sock);

  if (!(ssl = SSL_new(_hssl_context)))
  {
    log_warn("SSL_new failed");
    return herror_new("hssl_server_ssl", HSSL_ERROR_SERVER,
                      "Cannot create SSL object");
  }
  /* SSL_set_fd(ssl, sock->sock); */

  sbio = BIO_new_socket(sock->sock, BIO_NOCLOSE);

  if (sbio == NULL)
  {
    log_error("BIO_new_socket failed");
    return NULL;
  }
  /* BIO_set_callback(sbio, hssl_bio_cb); */
  sbio->method->bread = _hssl_bio_read;
  SSL_set_bio(ssl, sbio, sbio);

  if ((ret = SSL_accept(ssl)) <= 0)
  {
    herror_t err;

    log_error("SSL_accept failed (%s)", _hssl_get_error(ssl, ret));

    err = herror_new("hssl_server_ssl", HSSL_ERROR_SERVER, "SSL_accept failed (%s)", _hssl_get_error(ssl, ret));
    SSL_free(ssl);

    return err;
  }

  sock->ssl = ssl;

  return H_OK;
}

void
hssl_cleanup(struct hsocket_t * sock)
{
  if (sock->ssl)
  {
    SSL_shutdown(sock->ssl);
    SSL_free(sock->ssl);
    sock->ssl = NULL;
  }

  return;
}

herror_t
hssl_read(struct hsocket_t * sock, char *buf, size_t len, size_t * received)
{
  int count;

/* log_verbose("sock->sock=%d sock->ssl=%p, len=%li", sock->sock, sock->ssl, len); */

  if (sock->ssl)
  {
    if ((count = SSL_read(sock->ssl, buf, len)) < 1)
      return herror_new("hssl_read", HSOCKET_ERROR_RECEIVE,
                        "SSL_read failed (%s)", _hssl_get_error(sock->ssl,
                                                                count));
  }
  else
  {
    if ((count = hsocket_select_recv(sock->sock, buf, len)) == -1)
      return herror_new("hssl_read", HSOCKET_ERROR_RECEIVE,
                        "recv failed (%s)", strerror(errno));
  }
  *received = count;

  return H_OK;
}


herror_t
hssl_write(struct hsocket_t * sock, const char *buf, size_t len, size_t * sent)
{
  int count;

/*  log_verbose("sock->sock=%d, sock->ssl=%p, len=%li", sock->sock, sock->ssl, len); */

  if (sock->ssl)
  {
    if ((count = SSL_write(sock->ssl, buf, len)) == -1)
      return herror_new("hssl_write", HSOCKET_ERROR_SEND,
                        "SSL_write failed (%s)", _hssl_get_error(sock->ssl,
                                                                 count));
  }
  else
  {
    if ((count = send(sock->sock, buf, len, 0)) == -1)
      return herror_new("hssl_write", HSOCKET_ERROR_SEND, "send failed (%s)",
                        strerror(errno));
  }
  *sent = count;

  return H_OK;
}