trunk/src/tls_openssl.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2015 Attila Molnar <attilamolnar@hush.com>
 *  Copyright (c) 2015 Adam <Adam@anope.org>
 *  Copyright (c) 2005-2016 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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
 */

/*! \file tls_openssl.c
 * \brief Includes all OpenSSL-specific TLS functions
 * \version $Id$
 */

#include "stdinc.h"
#include "tls.h"
#include "conf.h"
#include "log.h"
#include "misc.h"
#include "memory.h"

#ifdef HAVE_TLS_OPENSSL

static int TLS_initialized;

/*
 * report_crypto_errors - Dump crypto error list to log
 */
static void
report_crypto_errors(void)
{
  unsigned long e = 0;

  while ((e = ERR_get_error()))
    ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
}

static int
always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
{
  return 1;
}

int
tls_is_initialized(void)
{
  return TLS_initialized;
}

/* tls_init()
 *
 * inputs       - nothing
 * output       - nothing
 * side effects - setups SSL context.
 */
void
tls_init(void)
{
  SSL_load_error_strings();
  SSLeay_add_ssl_algorithms();

  if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
  {
    const char *s = ERR_lib_error_string(ERR_get_error());

    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Server context -- %s", s);
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TICKET);
  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE|SSL_OP_CIPHER_SERVER_PREFERENCE);
  SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
                     always_accept_verify_cb);
  SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
  SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");

#ifndef OPENSSL_NO_ECDH
  EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);

  if (key)
  {
    SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
    EC_KEY_free(key);
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
#endif

  if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
  {
    const char *s = ERR_lib_error_string(ERR_get_error());

    ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Client context -- %s", s);
    exit(EXIT_FAILURE);
    return;  /* Not reached */
  }

  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2|SSL_OP_NO_SSLv3|SSL_OP_NO_TICKET);
  SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
  SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,
                     always_accept_verify_cb);
  SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
}

int
tls_new_cred(void)
{
  TLS_initialized = 0;

  if (!ConfigServerInfo.ssl_certificate_file || !ConfigServerInfo.rsa_private_key_file)
    return 1;

  if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 ||
      SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
  {
    report_crypto_errors();
    return 0;
  }

  if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 ||
      SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
  {
    report_crypto_errors();
    return 0;
  }

  if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) ||
      !SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
  {
    report_crypto_errors();
    return 0;
  }

  if (ConfigServerInfo.ssl_dh_param_file)
  {
    BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");

    if (file)
    {
      DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);

      BIO_free(file);

      if (dh)
      {
        if (DH_size(dh) >= 256)
          SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
        else
          ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");

        DH_free(dh);
      }
    }
    else
      ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
  }

#ifndef OPENSSL_NO_ECDH
  if (ConfigServerInfo.ssl_dh_elliptic_curve)
  {
    int nid = 0;
    EC_KEY *key = NULL;

    if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
      goto set_default_curve;

    if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
      goto set_default_curve;

    SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
    EC_KEY_free(key);
  }
  else
  {
    EC_KEY *key;

set_default_curve:

    key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);

    if (key)
    {
      SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
      EC_KEY_free(key);
    }
  }
#endif

  if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
    ConfigServerInfo.message_digest_algorithm = EVP_sha256();
  else
  {
    ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);

    if (ConfigServerInfo.message_digest_algorithm == NULL)
    {
      ConfigServerInfo.message_digest_algorithm = EVP_sha256();
      ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
    }
  }

  if (ConfigServerInfo.ssl_cipher_list)
    SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);

  TLS_initialized = 1;
  return 1;
}

const char *
tls_get_cipher(const tls_data_t *tls_data)
{
  static char buffer[IRCD_BUFSIZE];
  int bits = 0;
  SSL *ssl = *tls_data;

  SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);

  snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
           SSL_get_cipher(ssl), bits);
  return buffer;
}

int
tls_isusing(tls_data_t *tls_data)
{
  SSL *ssl = *tls_data;
  return ssl != NULL;
}

void
tls_free(tls_data_t *tls_data)
{
  SSL_free(*tls_data);
  *tls_data = NULL;
}

int
tls_read(tls_data_t *tls_data, char *buf, size_t bufsize, int *want_write)
{
  SSL *ssl = *tls_data;
  int length = SSL_read(ssl, buf, bufsize);

  /* Translate openssl error codes, sigh */
  if (length < 0)
  {
    switch (SSL_get_error(ssl, length))
    {
      case SSL_ERROR_WANT_WRITE:
      {
        /* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
        *want_write = 1;
        break;
      }
      case SSL_ERROR_WANT_READ:
        errno = EWOULDBLOCK;
      case SSL_ERROR_SYSCALL:
        break;
      case SSL_ERROR_SSL:
        if (errno == EAGAIN)
          break;
      /* Fall through */
      default:
        length = errno = 0;
    }
  }

  return length;
}

int
tls_write(tls_data_t *tls_data, const char *buf, size_t bufsize, int *want_read)
{
  SSL *ssl = *tls_data;
  int retlen = SSL_write(ssl, buf, bufsize);

  /* Translate openssl error codes, sigh */
  if (retlen < 0)
  {
    switch (SSL_get_error(ssl, retlen))
    {
      case SSL_ERROR_WANT_READ:
        *want_read = 1;
        break;  /* Retry later, don't register for write events */
      case SSL_ERROR_WANT_WRITE:
        errno = EWOULDBLOCK;
        break;
      case SSL_ERROR_SYSCALL:
        break;
      case SSL_ERROR_SSL:
        if (errno == EAGAIN)
          break;
      /* Fall through */
      default:
        retlen = errno = 0;  /* Either an SSL-specific error or EOF */
    }
  }

  return retlen;
}

void
tls_shutdown(tls_data_t *tls_data)
{
  SSL *ssl = *tls_data;

  SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);

  if (!SSL_shutdown(ssl))
    SSL_shutdown(ssl);
}

int
tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
{
  SSL *ssl;

  if (!TLS_initialized)
    return 0;

  if (role == TLS_ROLE_SERVER)
    ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
  else
    ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);

  if (!ssl)
  {
    ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
         ERR_error_string(ERR_get_error(), NULL));
    return 0;
  }

  *tls_data = ssl;
  SSL_set_fd(ssl, fd);
  return 1;
}

int
tls_set_ciphers(tls_data_t *tls_data, const char *cipher_list)
{
  SSL_set_cipher_list(*tls_data, cipher_list);
  return 1;
}

tls_handshake_status_t
tls_handshake(tls_data_t *tls_data, tls_role_t role, const char **errstr)
{
  SSL *ssl = *tls_data;
  int ret;

  if (role == TLS_ROLE_SERVER)
    ret = SSL_accept(ssl);
  else
    ret = SSL_connect(ssl);

  if (ret > 0)
    return TLS_HANDSHAKE_DONE;

  switch (SSL_get_error(ssl, ret))
  {
    case SSL_ERROR_WANT_WRITE:
      return TLS_HANDSHAKE_WANT_WRITE;
    case SSL_ERROR_WANT_READ:
      return TLS_HANDSHAKE_WANT_READ;
    default:
    {
      const char *error = ERR_error_string(ERR_get_error(), NULL);

      if (errstr)
        *errstr = error;

      return TLS_HANDSHAKE_ERROR;
    }
  }
}

int
tls_verify_cert(tls_data_t *tls_data, tls_md_t digest, char **fingerprint)
{
  SSL *ssl = *tls_data;
  X509 *cert = SSL_get_peer_certificate(ssl);
  unsigned int n;
  char buf[EVP_MAX_MD_SIZE * 2 + 1];
  unsigned char md[EVP_MAX_MD_SIZE];
  int ret = 0;

  /* Accept NULL return from SSL_get_peer_certificate */
  if (!cert)
    return 1;

  int res = SSL_get_verify_result(ssl);
  if (res == X509_V_OK || res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN ||
      res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
      res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
  {
    ret = 1;

    if (X509_digest(cert, digest, md, &n))
    {
      binary_to_hex(md, buf, n);
      *fingerprint = xstrdup(buf);
    }
  }

  X509_free(cert);
  return ret;
}
#endif  /* HAVE_TLS_OPENSSL */
Revision:	7278
Committed:	Sun Feb 7 15:28:26 2016 UTC (9 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	10761 byte(s)
Log Message:	- tls_openssl.c: removed logging to stderr which is closed at this point anyway
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2015 Attila Molnar <attilamolnar@hush.com>
5	* Copyright (c) 2015 Adam <Adam@anope.org>
6	* Copyright (c) 2005-2016 ircd-hybrid development team
7	*
8	* This program is free software; you can redistribute it and/or modify
9	* it under the terms of the GNU General Public License as published by
10	* the Free Software Foundation; either version 2 of the License, or
11	* (at your option) any later version.
12	*
13	* This program is distributed in the hope that it will be useful,
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	* GNU General Public License for more details.
17	*
18	* You should have received a copy of the GNU General Public License
19	* along with this program; if not, write to the Free Software
20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
21	* USA
22	*/
23
24	/*! \file tls_openssl.c
25	* \brief Includes all OpenSSL-specific TLS functions
26	* \version $Id$
27	*/
28
29	#include "stdinc.h"
30	#include "tls.h"
31	#include "conf.h"
32	#include "log.h"
33	#include "misc.h"
34	#include "memory.h"
35
36	#ifdef HAVE_TLS_OPENSSL
37
38	static int TLS_initialized;
39
40	/*
41	* report_crypto_errors - Dump crypto error list to log
42	*/
43	static void
44	report_crypto_errors(void)
45	{
46	unsigned long e = 0;
47
48	while ((e = ERR_get_error()))
49	ilog(LOG_TYPE_IRCD, "SSL error: %s", ERR_error_string(e, 0));
50	}
51
52	static int
53	always_accept_verify_cb(int preverify_ok, X509_STORE_CTX *x509_ctx)
54	{
55	return 1;
56	}
57
58	int
59	tls_is_initialized(void)
60	{
61	return TLS_initialized;
62	}
63
64	/* tls_init()
65	*
66	* inputs - nothing
67	* output - nothing
68	* side effects - setups SSL context.
69	*/
70	void
71	tls_init(void)
72	{
73	SSL_load_error_strings();
74	SSLeay_add_ssl_algorithms();
75
76	if (!(ConfigServerInfo.tls_ctx.server_ctx = SSL_CTX_new(SSLv23_server_method())))
77	{
78	const char *s = ERR_lib_error_string(ERR_get_error());
79
80	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Server context -- %s", s);
81	exit(EXIT_FAILURE);
82	return; /* Not reached */
83	}
84
85	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
86	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_DH_USE\|SSL_OP_CIPHER_SERVER_PREFERENCE);
87	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.server_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
88	always_accept_verify_cb);
89	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.server_ctx, SSL_SESS_CACHE_OFF);
90	SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, "EECDH+HIGH:EDH+HIGH:HIGH:!aNULL");
91
92	#ifndef OPENSSL_NO_ECDH
93	EC_KEY *key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
94
95	if (key)
96	{
97	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
98	EC_KEY_free(key);
99	}
100
101	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.server_ctx, SSL_OP_SINGLE_ECDH_USE);
102	#endif
103
104	if (!(ConfigServerInfo.tls_ctx.client_ctx = SSL_CTX_new(SSLv23_client_method())))
105	{
106	const char *s = ERR_lib_error_string(ERR_get_error());
107
108	ilog(LOG_TYPE_IRCD, "ERROR: Could not initialize the TLS Client context -- %s", s);
109	exit(EXIT_FAILURE);
110	return; /* Not reached */
111	}
112
113	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_NO_SSLv2\|SSL_OP_NO_SSLv3\|SSL_OP_NO_TICKET);
114	SSL_CTX_set_options(ConfigServerInfo.tls_ctx.client_ctx, SSL_OP_SINGLE_DH_USE);
115	SSL_CTX_set_verify(ConfigServerInfo.tls_ctx.client_ctx, SSL_VERIFY_PEER\|SSL_VERIFY_CLIENT_ONCE,
116	always_accept_verify_cb);
117	SSL_CTX_set_session_cache_mode(ConfigServerInfo.tls_ctx.client_ctx, SSL_SESS_CACHE_OFF);
118	}
119
120	int
121	tls_new_cred(void)
122	{
123	TLS_initialized = 0;
124
125	if (!ConfigServerInfo.ssl_certificate_file \|\| !ConfigServerInfo.rsa_private_key_file)
126	return 1;
127
128	if (SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_certificate_file) <= 0 \|\|
129	SSL_CTX_use_certificate_chain_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.ssl_certificate_file) <= 0)
130	{
131	report_crypto_errors();
132	return 0;
133	}
134
135	if (SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0 \|\|
136	SSL_CTX_use_PrivateKey_file(ConfigServerInfo.tls_ctx.client_ctx, ConfigServerInfo.rsa_private_key_file, SSL_FILETYPE_PEM) <= 0)
137	{
138	report_crypto_errors();
139	return 0;
140	}
141
142	if (!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.server_ctx) \|\|
143	!SSL_CTX_check_private_key(ConfigServerInfo.tls_ctx.client_ctx))
144	{
145	report_crypto_errors();
146	return 0;
147	}
148
149	if (ConfigServerInfo.ssl_dh_param_file)
150	{
151	BIO *file = BIO_new_file(ConfigServerInfo.ssl_dh_param_file, "r");
152
153	if (file)
154	{
155	DH *dh = PEM_read_bio_DHparams(file, NULL, NULL, NULL);
156
157	BIO_free(file);
158
159	if (dh)
160	{
161	if (DH_size(dh) >= 256)
162	SSL_CTX_set_tmp_dh(ConfigServerInfo.tls_ctx.server_ctx, dh);
163	else
164	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- need at least a 2048 bit DH prime size");
165
166	DH_free(dh);
167	}
168	}
169	else
170	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_dh_param_file -- could not open/read Diffie-Hellman parameter file");
171	}
172
173	#ifndef OPENSSL_NO_ECDH
174	if (ConfigServerInfo.ssl_dh_elliptic_curve)
175	{
176	int nid = 0;
177	EC_KEY *key = NULL;
178
179	if ((nid = OBJ_sn2nid(ConfigServerInfo.ssl_dh_elliptic_curve)) == 0)
180	goto set_default_curve;
181
182	if ((key = EC_KEY_new_by_curve_name(nid)) == NULL)
183	goto set_default_curve;
184
185	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
186	EC_KEY_free(key);
187	}
188	else
189	{
190	EC_KEY *key;
191
192	set_default_curve:
193
194	key = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
195
196	if (key)
197	{
198	SSL_CTX_set_tmp_ecdh(ConfigServerInfo.tls_ctx.server_ctx, key);
199	EC_KEY_free(key);
200	}
201	}
202	#endif
203
204	if (ConfigServerInfo.ssl_message_digest_algorithm == NULL)
205	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
206	else
207	{
208	ConfigServerInfo.message_digest_algorithm = EVP_get_digestbyname(ConfigServerInfo.ssl_message_digest_algorithm);
209
210	if (ConfigServerInfo.message_digest_algorithm == NULL)
211	{
212	ConfigServerInfo.message_digest_algorithm = EVP_sha256();
213	ilog(LOG_TYPE_IRCD, "Ignoring serverinfo::ssl_message_digest_algorithm -- unknown message digest algorithm");
214	}
215	}
216
217	if (ConfigServerInfo.ssl_cipher_list)
218	SSL_CTX_set_cipher_list(ConfigServerInfo.tls_ctx.server_ctx, ConfigServerInfo.ssl_cipher_list);
219
220	TLS_initialized = 1;
221	return 1;
222	}
223
224	const char *
225	tls_get_cipher(const tls_data_t *tls_data)
226	{
227	static char buffer[IRCD_BUFSIZE];
228	int bits = 0;
229	SSL ssl = tls_data;
230
231	SSL_CIPHER_get_bits(SSL_get_current_cipher(ssl), &bits);
232
233	snprintf(buffer, sizeof(buffer), "%s-%s-%d", SSL_get_version(ssl),
234	SSL_get_cipher(ssl), bits);
235	return buffer;
236	}
237
238	int
239	tls_isusing(tls_data_t *tls_data)
240	{
241	SSL ssl = tls_data;
242	return ssl != NULL;
243	}
244
245	void
246	tls_free(tls_data_t *tls_data)
247	{
248	SSL_free(*tls_data);
249	*tls_data = NULL;
250	}
251
252	int
253	tls_read(tls_data_t tls_data, char buf, size_t bufsize, int *want_write)
254	{
255	SSL ssl = tls_data;
256	int length = SSL_read(ssl, buf, bufsize);
257
258	/* Translate openssl error codes, sigh */
259	if (length < 0)
260	{
261	switch (SSL_get_error(ssl, length))
262	{
263	case SSL_ERROR_WANT_WRITE:
264	{
265	/* OpenSSL wants to write, we signal this to the caller and do nothing about that here */
266	*want_write = 1;
267	break;
268	}
269	case SSL_ERROR_WANT_READ:
270	errno = EWOULDBLOCK;
271	case SSL_ERROR_SYSCALL:
272	break;
273	case SSL_ERROR_SSL:
274	if (errno == EAGAIN)
275	break;
276	/* Fall through */
277	default:
278	length = errno = 0;
279	}
280	}
281
282	return length;
283	}
284
285	int
286	tls_write(tls_data_t tls_data, const char buf, size_t bufsize, int *want_read)
287	{
288	SSL ssl = tls_data;
289	int retlen = SSL_write(ssl, buf, bufsize);
290
291	/* Translate openssl error codes, sigh */
292	if (retlen < 0)
293	{
294	switch (SSL_get_error(ssl, retlen))
295	{
296	case SSL_ERROR_WANT_READ:
297	*want_read = 1;
298	break; /* Retry later, don't register for write events */
299	case SSL_ERROR_WANT_WRITE:
300	errno = EWOULDBLOCK;
301	break;
302	case SSL_ERROR_SYSCALL:
303	break;
304	case SSL_ERROR_SSL:
305	if (errno == EAGAIN)
306	break;
307	/* Fall through */
308	default:
309	retlen = errno = 0; /* Either an SSL-specific error or EOF */
310	}
311	}
312
313	return retlen;
314	}
315
316	void
317	tls_shutdown(tls_data_t *tls_data)
318	{
319	SSL ssl = tls_data;
320
321	SSL_set_shutdown(ssl, SSL_RECEIVED_SHUTDOWN);
322
323	if (!SSL_shutdown(ssl))
324	SSL_shutdown(ssl);
325	}
326
327	int
328	tls_new(tls_data_t *tls_data, int fd, tls_role_t role)
329	{
330	SSL *ssl;
331
332	if (!TLS_initialized)
333	return 0;
334
335	if (role == TLS_ROLE_SERVER)
336	ssl = SSL_new(ConfigServerInfo.tls_ctx.server_ctx);
337	else
338	ssl = SSL_new(ConfigServerInfo.tls_ctx.client_ctx);
339
340	if (!ssl)
341	{
342	ilog(LOG_TYPE_IRCD, "SSL_new() ERROR! -- %s",
343	ERR_error_string(ERR_get_error(), NULL));
344	return 0;
345	}
346
347	*tls_data = ssl;
348	SSL_set_fd(ssl, fd);
349	return 1;
350	}
351
352	int
353	tls_set_ciphers(tls_data_t tls_data, const char cipher_list)
354	{
355	SSL_set_cipher_list(*tls_data, cipher_list);
356	return 1;
357	}
358
359	tls_handshake_status_t
360	tls_handshake(tls_data_t tls_data, tls_role_t role, const char *errstr)
361	{
362	SSL ssl = tls_data;
363	int ret;
364
365	if (role == TLS_ROLE_SERVER)
366	ret = SSL_accept(ssl);
367	else
368	ret = SSL_connect(ssl);
369
370	if (ret > 0)
371	return TLS_HANDSHAKE_DONE;
372
373	switch (SSL_get_error(ssl, ret))
374	{
375	case SSL_ERROR_WANT_WRITE:
376	return TLS_HANDSHAKE_WANT_WRITE;
377	case SSL_ERROR_WANT_READ:
378	return TLS_HANDSHAKE_WANT_READ;
379	default:
380	{
381	const char *error = ERR_error_string(ERR_get_error(), NULL);
382
383	if (errstr)
384	*errstr = error;
385
386	return TLS_HANDSHAKE_ERROR;
387	}
388	}
389	}
390
391	int
392	tls_verify_cert(tls_data_t tls_data, tls_md_t digest, char *fingerprint)
393	{
394	SSL ssl = tls_data;
395	X509 *cert = SSL_get_peer_certificate(ssl);
396	unsigned int n;
397	char buf[EVP_MAX_MD_SIZE * 2 + 1];
398	unsigned char md[EVP_MAX_MD_SIZE];
399	int ret = 0;
400
401	/* Accept NULL return from SSL_get_peer_certificate */
402	if (!cert)
403	return 1;
404
405	int res = SSL_get_verify_result(ssl);
406	if (res == X509_V_OK \|\| res == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN \|\|
407	res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE \|\|
408	res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
409	{
410	ret = 1;
411
412	if (X509_digest(cert, digest, md, &n))
413	{
414	binary_to_hex(md, buf, n);
415	*fingerprint = xstrdup(buf);
416	}
417	}
418
419	X509_free(cert);
420	return ret;
421	}
422	#endif /* HAVE_TLS_OPENSSL */